A cloudy ring, greasy watch bracelet, or film-covered pair of glasses often needs more than a polishing cloth can reach. The right concentrate lets an ultrasonic machine work into settings and hinges without leaving a sticky residue behind. The Best ultrasonic jewelry cleaning solution should also give clear mixing instructions and identify materials it cannot safely clean.
We compared ten concentrated formulas, from small everyday bottles to large-volume options designed for frequent cycles. The iSonic 8-oz Concentrate is our top pick, while the rest cover refill packs, broad material compatibility, low-suds formulas, and high-yield dilution.
Comparison table
| # | Product | Award | Size | Mixing or yield | Best for |
|---|---|---|---|---|---|
| 1 | iSonic 8-oz Concentrate | Best overall | 8 fl oz | One capful per use | Jewelry, watches, and eyewear |
| 2 | iSonic 2-Pack Concentrate | Best refill supply | 8 fl oz, pack of 2 | One capful per use | Frequent household cleaning |
| 3 | Blitz Gem Cleaner Refill | Best established formula | 8 oz | Concentrated, up to 8 times the use | Gold, silver, platinum, and gems |
| 4 | Evo Dyne Concentrate | Best fragrance-free option | 4 fl oz, pack of 2 | One capful per use | Jewelry care without fragrance |
| 5 | Sylvan Hills 32-oz Solution | Best high-volume bottle | 32 oz | 1:250, over 50 gallons | Frequent machine use |
| 6 | ERRECOM U-Sonic 17-oz | Best dilution flexibility | 17 fl oz | 1:10 to 1:40 | Mixed cleaning loads |
| 7 | kunphy 4-oz Concentrate | Best for multiple application methods | 4 fl oz | Mix with water | Jewelry, glasses, and watches |
| 8 | WoldoClean 8-Gallon Concentrate | Best for larger tanks | 25.4 fl oz | 1:40, up to 8 gallons | Home and professional machines |
| 9 | Bcom 8.5-oz Low-Suds Formula | Best low-residue formula | 250 ml | Precise dilution recommended | Rings, retainers, and watches |
| 10 | Maplefield 16-oz Concentrate | Best measured dosing | 16 fl oz | Half capful per 20 fl oz basin | Regular jewelry cleaning |
1. iSonic 8-oz Concentrate: Best Overall
Pros
- Works across jewelry, watches, and eyewear
- One-capful dosing is easy to remember
- Non-toxic and biodegradable formula
- Designed to remove oils, dirt, and tarnish
Cons
- The bottle is smaller than high-volume concentrates
- The formula does not provide a detailed dilution ratio
Best for: households that want one concentrate for jewelry and glasses.
The iSonic 8-oz Concentrate is the easiest recommendation because it covers the jobs most people actually bring to an ultrasonic cleaner. Its formula is intended for gold, silver, diamonds, rings, watches, glasses, and other eyewear. That broad scope matters when the machine comes out for a wedding band one day and smudged lenses the next.
The concentrate calls for one capful per use, a useful instruction that avoids guesswork around a small home tank. It is made in the United States and described as non-toxic and biodegradable. The formula is also intended to reach buildup in crevices that cloths and brushes miss, especially around ring settings and watch details.
Compared with Blitz Gem Cleaner Refill, iSonic gives eyewear more prominence and is the more natural all-purpose choice. Sylvan Hills 32-oz Solution makes more sense for someone running many cycles, but its large bottle takes up more storage space and requires a precise 1:250 mix. iSonic is less complicated for ordinary jewelry care.
The limitation is the lack of a published numerical dilution ratio. One capful is convenient, but users with unusually small or large tanks may prefer the more explicit instructions on Maplefield 16-oz Concentrate or ERRECOM U-Sonic 17-oz. Skip iSonic if you specifically need a high-volume commercial-style concentrate or want a formula with a stated list of materials to avoid.
For everyone else, this is the sensible starting point. It combines broad compatibility, straightforward dosing, and a formula aimed at the oily residue that makes jewelry look dull in the first place.
2. iSonic 2-Pack Concentrate: Best Refill Supply
Pros
- Same multi-purpose formula as the single bottle
- Two 8-fl-oz bottles provide a longer supply
- Intended for jewelry, watches, glasses, and retainers
- One-capful dosing keeps routine use simple
Cons
- No numerical dilution ratio is listed
- Takes more storage space than a single bottle
Best for: regular users who do not want to replace their concentrate often.
The iSonic 2-Pack Concentrate is not a different cleaning formula from the single iSonic bottle. Its appeal is continuity. If your household cleans rings, glasses, watches, retainers, or dentures regularly, keeping a spare bottle nearby is more practical than discovering an empty container when the machine is already filled.
Each bottle is 8 fluid ounces, and the concentrate uses one capful per cleaning session. The formula is described as non-toxic and biodegradable, with enough cleaning strength to lift oils, dirt, and tarnish from gold, silver, diamond, and ring surfaces. Its stated use across jewelry and eyewear makes it more versatile than a product aimed only at precious metals.
The 2-Pack is the logical step up from iSonic 8-oz Concentrate, not a performance upgrade. Choose it when storage and supply matter. Evo Dyne Concentrate also comes in two bottles and adds fragrance-free positioning, while iSonic has the clearer emphasis on glasses and eye wear. Blitz Gem Cleaner Refill is a stronger alternative for shoppers focused on the brand’s long jewelry-cleaning history and gemstone coverage.
The same weakness remains: the directions provide one-capful dosing but do not state a water ratio in the available details. That can be less precise than the 1:40 guidance on WoldoClean 8-Gallon Concentrate. Users should also remember that a cleaning solution does not make every gemstone suitable for ultrasonic treatment.
This is the pick for a busy home, a small jewelry collection that is cleaned often, or anyone who prefers to keep a backup on hand. It is identical in role to the single bottle, but better suited to a routine rather than occasional use.
3. Blitz Gem Cleaner Refill: Best Established Formula
Pros
- Intended for gold, silver, and platinum
- Covers diamonds and many semi-precious stones
- Non-toxic, non-abrasive, and biodegradable
- Free of alcohol, ammonia, and VOCs
Cons
- Eyewear is not emphasized as strongly as with iSonic
- The available details do not give a water ratio
Best for: jewelry owners who want broad gemstone coverage from a dedicated jewelry formula.
Blitz Gem Cleaner Refill is the most jewelry-specific option near the top of this list. It is designed to remove fingerprints, buildup, and dirt from gold, silver, and platinum, while also addressing diamonds, rubies, sapphires, topaz, amethyst, citrine, quartz, and other stones named in its product details.
The concentrate is described as providing up to eight times the use of the standard formula. That makes the bottle better suited to repeated ultrasonic sessions than a ready-to-use liquid would be. Its safety profile is also unusually clearly stated: the formula is non-toxic, non-abrasive, biodegradable, and free of alcohol, ammonia, and VOCs.
Compared with iSonic 8-oz Concentrate, Blitz places more weight on gemstone breadth and jewelry heritage, while iSonic is the more convincing all-purpose cleaner for glasses and watches. kunphy 4-oz Concentrate also names a long list of gems, but Blitz offers a larger bottle and more specific information about what the formula excludes.
The missing detail is a precise water ratio. The product is clearly a concentrate refill, but users who want a measurement they can reproduce exactly should look at Maplefield 16-oz Concentrate, which specifies half a capful for a 20-fluid-ounce basin. Blitz is also not a reason to ignore basic gemstone precautions. Pearls and other porous or delicate materials should not automatically go into an ultrasonic bath.
Pick Blitz when the machine is mainly for rings, necklaces, earrings, and stones rather than spectacles or retainers. It is a focused cleaner with a thoughtful ingredient profile and broad stated gemstone compatibility.
4. Evo Dyne Concentrate: Best Fragrance-Free Option
Pros
- Unscented and fragrance-free
- Works with or without an ultrasonic machine
- Uses chelating agents to bind metal impurities
- Made in the United States
- Pack contains two 4-fl-oz bottles
Cons
- Individual bottles are smaller
- The available details do not identify a specific dilution ratio
Best for: users who dislike scented cleaners and want a concentrate for occasional manual use too.
Evo Dyne Concentrate stands out because it is not limited to ultrasonic machines. The product can also be applied with a soft brush for a quick shine, which gives it a useful second role when a ring needs attention but running the entire machine feels excessive.
Its formula targets dirt, oils, tarnish, and metal impurities. The product specifically mentions advanced chelating agents, which are intended to lift and bind those impurities rather than simply wet the surface. It is unscented, fragrance-free, and described as environmentally friendly, qualities that will appeal to anyone sensitive to strong cleaning smells.
The listing identifies this version as a two-pack of 4-fluid-ounce bottles. That is more portable than the single 8-ounce bottles from iSonic 8-oz Concentrate and Blitz Gem Cleaner Refill, though it means opening or storing two smaller containers. Evo Dyne also claims up to 72 deep-clean sessions per two-pack, but the available information does not explain the exact tank size or dilution behind that figure.
The weakness is measurement clarity. The instructions mention one capful, but there is no stated ratio comparable to ERRECOM U-Sonic 17-oz, which allows dilution from 1:10 to 1:40 depending on the dirt level. Users who want a precisely repeatable mixture may prefer ERRECOM or Bcom 8.5-oz Low-Suds Formula.
Evo Dyne is a strong fit for fragrance-free households and people who sometimes clean by hand. It is less compelling for high-volume users who need a large bottle, but its flexible application makes it more useful than a machine-only concentrate.
5. Sylvan Hills 32-oz Solution: Best High-Volume Bottle
Pros
- 32-ounce bottle for frequent cleaning
- 1:250 mixing ratio is clearly stated
- Makes over 50 gallons of cleaning fluid
- Non-ammoniated and non-abrasive
- Includes a polishing cloth
Cons
- Large bottle needs more storage room
- Mixing ratio requires careful measuring
Best for: households, studios, or small businesses that run many ultrasonic cycles.
The main reason to choose Sylvan Hills 32-oz Solution is scale. Its 32-ounce bottle is much larger than the standard 8-ounce options, and the stated 1:250 ratio is designed to turn that concentrate into more than 50 gallons of ready-to-use fluid. That is a meaningful distinction for frequent machine use, not a minor packaging variation.
The formula is intended for rings, earrings, necklaces, glasses, watches, gold, silver, diamonds, and gemstones. It is described as non-toxic, non-ammoniated, and free of abrasives, so the product aims to remove lotion, oil, fingerprints, and dirt without the harsher profile associated with some household cleaners. The included polishing cloth is useful for drying and finishing pieces after the ultrasonic cycle.
Compared with WoldoClean 8-Gallon Concentrate, Sylvan Hills offers a much larger stated yield, although WoldoClean provides more specific guidance for tank size and materials to avoid. iSonic 2-Pack Concentrate is much easier to store and dose for occasional use, but it is not aimed at the same volume of cleaning.
The catch is that 1:250 is precise enough to demand a measuring spoon, syringe, or other reliable method. Eyeballing a tiny amount in a full tank undermines the point of a high-yield concentrate. The bottle is also overkill for someone who cleans a ring a few times a year.
Choose Sylvan Hills when the machine is part of a regular cleaning routine. It is the practical pick for repeated cycles, provided you are comfortable measuring accurately and have a place to store the bottle.
6. ERRECOM U-Sonic 17-oz: Best Dilution Flexibility
Pros
- Dilution range from 1:10 to 1:40
- Suitable for jewelry, eyewear, dentures, and small parts
- Intended for precious and semi-precious non-porous gems
- Biodegradable formula
- 17-fluid-ounce bottle
Cons
- Dilution range requires more judgment
- Not the highest-yield option in this group
Best for: users who want to adjust concentration for light or heavy buildup.
ERRECOM U-Sonic 17-oz is the most adaptable concentrate in the group. Its recommended dilution spans 1:10 to 1:40, allowing a stronger mixture for heavy grease and residue or a lighter one for routine cleaning. That is more useful than a vague instruction to add a capful when the machine size or soil level changes.
The formula is intended for diamonds, gold, silver, platinum, precious and semi-precious stones, watches, eyeglasses, sunglasses, dentures, aligners, razor heads, keys, coins, and small precision components. It also specifically says it is for non-porous gems. The stated yield reaches up to 5.28 gallons, and the product is described as biodegradable.
Against Sylvan Hills 32-oz Solution, ERRECOM gives up some volume but is easier to adapt to different cleaning jobs. WoldoClean 8-Gallon Concentrate offers a larger stated yield and is designed for machines with 8-to-64-fluid-ounce tanks, but it also warns against pearls, opals, and turquoise. ERRECOM is broader in its listed applications, though that should not be mistaken for permission to clean every material ultrasonically.
The downside is the learning curve. A range from 1:10 to 1:40 is helpful only if you know which end to use. New users may prefer the simpler one-capful approach of iSonic 8-oz Concentrate. The bottle is also less economical for someone who wants a high-volume supply.
ERRECOM is the right choice for a careful user with several machines, varied loads, or jewelry that alternates between light daily film and stubborn buildup. Its flexible instructions make it unusually easy to tailor.
7. kunphy 4-oz Concentrate: Best for Multiple Application Methods
Pros
- Intended for gold, silver, platinum, and many non-porous gems
- Can be used in a machine, as a dip, or in a spray bottle
- Suitable for jewelry, watches, and glasses
- Non-toxic and biodegradable
Cons
- Smallest bottle among several leading options
- The available details do not give a numerical dilution ratio
Best for: occasional users who want one concentrate for machine and manual cleaning.
kunphy 4-oz Concentrate is more flexible than its small bottle suggests. It can be mixed with water for an ultrasonic machine, used as a dip, or placed in a spray bottle. That makes it useful in homes where a machine handles the deeper cleaning but a quick manual touch-up is sometimes more convenient.
The stated material list includes gold, platinum, diamonds, ruby, sapphire, topaz, amethyst, aquamarine, garnet, and other non-porous precious and semi-precious gems. It also names watches, glasses, rings, and necklaces. The formula is described as non-toxic and biodegradable, with the goal of removing smudges, lotions, fingerprints, and daily buildup.
The 4-fluid-ounce size is noticeably smaller than Maplefield 16-oz Concentrate and ERRECOM U-Sonic 17-oz. It is easier to store, but frequent machine users will go through it sooner. The ability to use it without a machine gives kunphy an advantage over a formula purchased strictly for ultrasonic cycles.
The real limitation is the lack of a published numerical mix ratio. A careful user will need to follow the bottle directions and measure the concentrate rather than improvise. Bcom 8.5-oz Low-Suds Formula is a better fit when rinsing behavior and low foam are the priority, while Blitz Gem Cleaner Refill is more attractive for a larger jewelry-focused supply.
kunphy makes sense for a modest collection, a compact cleaning setup, or someone who wants one bottle that can handle several methods. It is not the choice for professional volume, but it is versatile in a way many small concentrates are not.
8. WoldoClean 8-Gallon Concentrate: Best for Larger Tanks
Pros
- 1:40 dilution ratio
- Makes up to 8 gallons of ready-to-use solution
- Intended for 8-to-64-fluid-ounce tanks
- Names materials that should be avoided
- Ammonia-free formula
Cons
- Not recommended for pearls, opals, or turquoise
- Large bottle is more than occasional users need
Best for: users with medium or large ultrasonic tanks who want stated tank compatibility.
WoldoClean 8-Gallon Concentrate is one of the clearest products here about machine size and material limits. It is intended for ultrasonic machines with tanks from 8 to 64 fluid ounces, which gives a buyer a useful way to judge fit before pouring anything into the basin.
The concentrate mixes at a 1:40 ratio and the 25.4-fluid-ounce bottle makes up to eight gallons of ready-to-use solution. Its stated uses include gold, platinum, diamonds, sterling necklaces, chains, watches, bracelets, earrings, sapphires, rubies, and emeralds. The formula is non-toxic and ammonia-free.
That explicit warning list is the major differentiator. WoldoClean says it is not recommended for pearls, opals, or turquoise. ERRECOM U-Sonic 17-oz also narrows its claim to non-porous gems, but WoldoClean makes the exclusions easier to spot. Sylvan Hills 32-oz Solution is the better high-volume choice if the published 50-plus-gallon yield matters more than tank guidance.
The product is less attractive for a tiny machine or occasional cleaning. A 1:40 ratio is manageable, but storing a 25.4-fluid-ounce bottle for infrequent use is unnecessary. The formula's broad gemstone list also should not override care instructions from a jeweler, particularly for treated or fragile stones.
WoldoClean is a well-defined choice for someone who knows the size of their tank and wants predictable dilution. Its warnings are not a drawback so much as useful honesty, provided you read them before cleaning a mixed collection.
9. Bcom 8.5-oz Low-Suds Formula: Best Low-Residue Formula
Pros
- Plant-based, non-toxic formula
- Low-suds blend rinses clean
- Intended for jewelry, watches, rings, and retainers
- Specifically warns about anti-glare eyewear coatings
- 250 ml bottle
Cons
- The available details do not state a mix ratio
- Eyeglasses with special coatings need extra caution
Best for: users who prioritize clean rinsing and also clean retainers.
Bcom 8.5-oz Low-Suds Formula takes a practical approach to ultrasonic cleaning. Its plant-based concentrate uses a low-suds anionic surfactant blend intended to rinse away cleanly without a sticky film or cloudy layer. That matters because residue can make a freshly cleaned ring look dull again.
The formula is designed for diamonds, gold, silver, watches, rings, and retainers. Its product details recommend using a dropper or spoon for precise dilution, although they do not provide the actual ratio. The bottle is listed as 250 milliliters, which is roughly the same category of capacity as the 8.5-fluid-ounce title suggests.
Bcom is more careful than many competitors around eyewear. It says to test or avoid glasses with special anti-glare coatings. That caveat gives it an advantage over broad claims from iSonic 8-oz Concentrate, but it also means Bcom is not the automatic choice for a household that mainly cleans coated lenses. For jewelry and retainers, its low-suds positioning is more relevant.
The missing dilution figure is the main weakness. Maplefield 16-oz Concentrate gives a much clearer half-capful instruction for a 20-fluid-ounce basin, while WoldoClean 8-Gallon Concentrate gives a 1:40 ratio. Bcom users will need to measure carefully from the product's instructions and avoid assuming that more concentrate means better cleaning.
Pick Bcom when rinsing behavior matters and retainers are part of the cleaning routine. It is a focused option with useful caution around coated eyewear, but less suitable for someone who wants maximum capacity or fully specified mixing guidance.
10. Maplefield 16-oz Concentrate: Best Measured Dosing
Pros
- Half-capful instruction for a 20-fluid-ounce basin
- 16-fluid-ounce bottle
- Intended for gold, silver, and gemstones
- Claims up to 95 cleaning cycles
- Works with ultrasonic machines
Cons
- Less information about specific stones to avoid
- Not the largest-volume concentrate here
Best for: users who want a simple dosing instruction for a common home tank.
Maplefield 16-oz Concentrate is built around a simple instruction: mix half a capful with 20 fluid ounces of water in the basin. That is the kind of guidance a home user can follow without converting a large dilution ratio or guessing what one capful means in a particular tank.
The formula is intended for gold, silver, diamonds, gemstones, and general jewelry cleaning. Maplefield says the 16-fluid-ounce bottle can provide up to 95 cleaning cycles. The available details do not explain the exact machine size behind that claim, so it is best treated as an estimate rather than a universal count.
Compared with Bcom 8.5-oz Low-Suds Formula, Maplefield is easier to dose but gives less detail about rinsing and special eyewear coatings. iSonic 8-oz Concentrate has broader stated use for glasses and watches, while Maplefield offers a larger bottle and a more concrete basin instruction. It is a sensible middle ground for jewelry-only households.
The weakness is limited material guidance. The product says it is safe on gold, silver, and gemstones, but the available information does not call out specific exclusions such as WoldoClean's warning about pearls, opals, and turquoise. Anyone cleaning unusual, treated, porous, or fragile stones should check with a jeweler first.
Maplefield is the pick for a straightforward home setup. Its dosing instruction is clearer than many competing concentrates, and the 16-ounce bottle gives regular jewelry users more supply without moving into the largest containers.
How to choose best ultrasonic jewelry cleaning solution
The right concentrate should match the machine, the materials in your jewelry box, and how often you clean. These are the factors that separate a convenient formula from one that creates extra measuring or rinsing work.
Material compatibility
Gold, silver, platinum, diamonds, and many non-porous gemstones appear across these products, but that does not mean every piece of jewelry is safe for an ultrasonic bath. Pearls, opals, turquoise, treated stones, loose stones, and fragile settings require particular caution. WoldoClean is one of the few products here that clearly says not to use its formula on pearls, opals, or turquoise.
Check the cleaner's stated material list, then check the jewelry maker's care instructions. A safe liquid cannot prevent damage caused by vibration, a weak setting, a fracture, or a porous gemstone.
A broad material claim is not a substitute for checking the stone before the first ultrasonic cycle.
Dilution instructions
A clear ratio makes repeatable cleaning easier. Sylvan Hills gives a 1:250 ratio, WoldoClean uses 1:40, and ERRECOM allows 1:10 to 1:40 depending on soil. Maplefield takes a more household-friendly route with half a capful for a 20-fluid-ounce basin.
Avoid adding extra concentrate just because the jewelry looks particularly dirty. Stronger is not automatically safer or more effective, and excess solution can make rinsing harder. If the instructions use capfuls, measure consistently.
Tank size and yield
Match the product's directions to the machine's basin. WoldoClean is specifically intended for 8-to-64-fluid-ounce tanks, while other products provide general machine guidance without a tank range. High-yield formulas such as Sylvan Hills make sense when the machine runs frequently, but a small bottle is easier to store for occasional use.
Yield claims should be read alongside the dilution method. A stated number of cycles depends on basin size, water volume, and how much concentrate is used each time.
Residue and foaming
A cleaner that rinses poorly can leave film on metal, lenses, or retainers. Bcom specifically promotes a low-suds formula that rinses without a sticky or cloudy layer. iSonic emphasizes a streak-free finish for eyewear, while several other products focus more heavily on jewelry.
Foam is not the same thing as cleaning strength. Use the recommended amount and rinse cleaned items with fresh water when the product instructions call for it.
Application range
Some formulas are intended only for ultrasonic machines. Others, such as Evo Dyne and kunphy, can also be used with a soft brush, as a dip, or in a spray bottle. That flexibility is useful for a single ring or watch that does not justify filling the machine.
Consider the other objects you plan to clean. iSonic, ERRECOM, and kunphy explicitly extend beyond jewelry to glasses, watches, or personal accessories. Bcom is notable for mentioning retainers while warning about special anti-glare coatings.
Frequently asked questions
Can I use these solutions in any ultrasonic jewelry cleaner?
Most of the products are described for use with ultrasonic machines, but the correct dilution depends on the cleaner's basin size. WoldoClean is specifically listed for tanks from 8 to 64 fluid ounces. Follow both the solution instructions and the machine manufacturer's guidance.
Are these solutions safe for diamonds and gold?
The products generally identify gold and diamonds as compatible materials. That does not guarantee that every diamond setting or piece is safe, since loose stones, damaged prongs, treatments, and fragile construction can still be affected by ultrasonic vibration. Inspect jewelry before cleaning and seek a jeweler's advice for valuable or unusual pieces.
Can ultrasonic jewelry cleaner be used on pearls?
Do not assume it is safe. WoldoClean specifically says not to use its formula on pearls, opals, or turquoise, and other products do not provide enough detail to override that general caution. Pearls are commonly cleaned with gentler methods instead.
Can I clean eyeglasses with jewelry cleaning solution?
Several formulas name eyeglasses, sunglasses, or eyewear as compatible. Bcom specifically advises testing or avoiding glasses with special anti-glare coatings. Check the lens manufacturer's care instructions before using any concentrate.
Should I use more concentrate for heavily dirty jewelry?
No. Use the stated ratio or the stronger end of a published range, such as ERRECOM's 1:10 to 1:40 guidance. Adding an unmeasured amount can increase residue and may not improve the result.
Do I need an ultrasonic machine for these solutions?
Not always. Evo Dyne says it can be used with a soft brush, and kunphy describes use as a dip or in a spray bottle as well as in a machine. A machine is useful for crevices, but manual cleaning can be more appropriate for delicate materials.
How should I dry jewelry after cleaning?
Rinse if the product instructions call for it, then dry the item with a clean, soft cloth. Sylvan Hills includes a polishing cloth for drying and shining items. Pay attention to settings, hinges, and crevices so water does not remain trapped.
The bottom line
The Best ultrasonic jewelry cleaning solution for most homes is iSonic 8-oz Concentrate. It covers jewelry, watches, and eyewear, uses simple one-capful dosing, and has a non-toxic, biodegradable formulation. Choose the iSonic 2-Pack Concentrate if you clean often and want the same formula on hand for longer.
For high-volume cleaning, Sylvan Hills 32-oz Solution is the more suitable choice because its 1:250 ratio and stated 50-plus-gallon yield are designed around repeated use. ERRECOM U-Sonic 17-oz is the better specialist option when you want to adjust concentration for different levels of buildup.
If you are undecided, choose the formula with instructions that match your tank and the materials in your jewelry rather than simply choosing the largest bottle.
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