After a soak, the water in a swim spa still needs care between sessions, and the best swim spa mineral cartridge is the cartridge that matches the spa system and the filter already in place. This list compares cartridges by stated gallon capacity, cartridge life, pack contents, and warranty.
This article is informational and is not medical advice. See our Medical Disclaimer.
Listings were collected 4 November 2026.
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Quick picks
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1
Replacement for Nature2 W20750 Spa Mineral Sticks Chill Score 9.6/10Check price on AmazonAn in-filter mineral stick in a 2-pack for spas up to 1000 gallons, with support stems and a 12-month warranty.
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2
Lisyee Mineral Cartridge + SmartChlor Cartridges Chill Score 9.6/10Check price on AmazonA mineral cartridge plus 4 SmartChlor cartridges for Jacuzzi and Sundance Frog @Ease spa systems, for hot tubs up to 600 gallons.
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3
Mineral Cartridge Replacement Compatible with Frog Chill Score 9.6/10Check price on AmazonA 2-pack of mineral cartridges for Frog @Ease in-line systems, for hot tubs up to 600 gallons.
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4
Zomixzo Mineral Cartridge Replacement Compatible Chill Score 9.5/10Check price on AmazonA 2-pack of mineral cartridges for Frog @Ease in-line systems, for hot tubs up to 600 gallons.
What we picked for home recovery
An in-filter mineral stick in a 2-pack for spas up to 1000 gallons, with support stems and a 12-month warranty.
Pros & ConsViewHide
Pros
- Fits spas up to 1000 gallons, the largest capacity stated here
- Drops into the core of most spa filters, per the listing
- Support stems keep the stick centered in the filter
- 12-month warranty stated
Cons
- Minimum filter length of 6.5 inches and hole diameter of 1-1/4 inches required
- Listing wording differs on chemicals: one bullet says no chemicals while another gives a 50% to 80% chlorine reduction
- No SmartChlor cartridge included or stated in the pack
- An in-filter stick, not a cartridge for a Frog @Ease in-line system
A mineral cartridge plus 4 SmartChlor cartridges for Jacuzzi and Sundance Frog @Ease spa systems, for hot tubs up to 600 gallons.
Pros & ConsViewHide
Pros
- Mineral cartridge lasts 4 months, per the listing
- 4 SmartChlor cartridges included, each lasting up to 3-4 weeks
- Slow-release technology for water clarity, per the listing
- Compatible with Jacuzzi and Sundance Frog @Ease systems, per the listing
Cons
- SmartChlor cartridges last weeks, not months, so replacements come sooner
- No concrete warranty term stated, only a service promise
- Dimensions of 5.0 by 4.0 by 6.0 inches must fit the existing system
- For Frog @Ease systems only, not a universal in-filter stick
A 2-pack of mineral cartridges for Frog @Ease in-line systems, for hot tubs up to 600 gallons.
Pros & ConsViewHide
Pros
- Cartridges stated to last 4 months
- Fits Marquis, Caldera, Artesian, and Hot Spring Frog @Ease systems, per the listing
- 2-pack for a second cartridge on hand
- Maker lists softer water and balanced pH
Cons
- SmartChlor sold separately, not included
- No concrete warranty term stated, only an after-sales promise
- For certain hot tub models only, up to 600 gallons
- Listing states a 4-month life without saying whether that is per cartridge or for the pack
A 2-pack of mineral cartridges for Frog @Ease in-line systems, for hot tubs up to 600 gallons.
Pros & ConsViewHide
Pros
- Snap-in design for quick replacement, per the listing
- Fits Marquis, Caldera, Artesian, and Hot Spring Frog @Ease systems, per the listing
- Maker lists up to 75% less chlorine than traditional systems
- 2-pack for a second cartridge on hand
Cons
- One cartridge provides up to 4 weeks, a shorter life than the 4-month picks here
- SmartChlor sold separately, not included
- No warranty term stated
- For certain systems only; check the model list before ordering
How mineral cartridges fit a swim spa
Two cartridge styles appear here: cartridges that replace a unit in a Frog @Ease in-line system, and a stick that drops into the core of an existing filter. The maker lists for each pick which systems it fits, so the system match matters more than the pack size.
Capacity, life, and pack
| Cartridge | Fits up to | Lasts | Pack |
|---|---|---|---|
| E-cowlboy Stick 2-Pack | 1000 gallons | 4 months | 2-pack |
| Lisyee Cartridge Set | 600 gallons | 4 months, mineral | 1 mineral, 4 SmartChlor |
| Nayoku Mineral 2-Pack | 600 gallons | 4 months | 2-pack |
| Zomixzo Mineral 2-Pack | 600 gallons | Up to 4 weeks | 2-pack |
Score notes
The Chill Score weighs performance, build, value, safety where it applies, and warranty. Safety is zero for all four picks, since no listing states a safety certification. Only one pick states a concrete warranty term, so only that pick scores for warranty.
| Product | Chill Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| E-cowlboy Stick 2-Pack | 9.6 | 28 | 20 | 20 | n/a | 3 |
| Lisyee Cartridge Set | 9.6 | 30 | 21 | 21 | n/a | 0 |
| Nayoku Mineral 2-Pack | 9.6 | 29 | 20 | 20 | n/a | 0 |
| Zomixzo Mineral 2-Pack | 9.5 | 26 | 20 | 19 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
How to choose the best swim spa mineral cartridge
Start with the system: Frog @Ease in-line cartridges fit only the listed systems, while the in-filter stick fits filters that meet its stated length and hole size. Then check the gallon capacity against the spa. For related water care, see our swim spa filters and hot tub water care system lists.
Then check the pack against the routine: a combined pack covers both cartridge types at once, while mineral-only packs need SmartChlor bought separately where the listing says so. Cartridge life ranges from up to 4 weeks to 4 months across the picks, so the replacement interval is part of the value.
Check Your Space First
- Check the spa system: Frog @Ease in-line cartridges fit only the listed systems, while the E-cowlboy stick fits in-filter systems.
- Check the filter dimensions: the in-filter stick needs a filter at least 6.5 inches long with a hole diameter of 1-1/4 inches.
- Check the gallon capacity against the spa: the picks cover up to 600 gallons or up to 1000 gallons.
- Check the pack: the Lisyee pack pairs a mineral cartridge with SmartChlor cartridges, while the other packs state mineral cartridges only or SmartChlor sold separately.
- Check the replacement interval: cartridge life ranges from up to 4 weeks to 4 months across the picks.
Common questions
How long does a mineral cartridge last?
It depends on the pick. The Lisyee mineral cartridge, the E-cowlboy stick, and the Nayoku cartridges are each stated to last 4 months, while one Zomixzo cartridge provides up to 4 weeks.
Do mineral cartridges replace chlorine entirely?
No. The Lisyee pack pairs a mineral cartridge with SmartChlor cartridges, and the Zomixzo and Nayoku cartridges work with SmartChlor sold separately. The E-cowlboy listing states a reduced need for chlorine, with a maker-listed reduction of 50% to 80%.
Will a cartridge fit any spa?
No. Frog @Ease in-line cartridges fit only the systems each listing names, and the in-filter stick needs a filter at least 6.5 inches long with a hole diameter of 1-1/4 inches. Check the system list and the filter dimensions before ordering.
What size spa does each cartridge cover?
Most picks cover hot tubs up to 600 gallons, and the E-cowlboy stick covers spas up to 1000 gallons. Match the stated capacity to the spa size.
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