Best Test Strips for Cold Plunge Under $25 (2026)

How to pick the best test strips for cold plunge under 25

Start with the sanitizer in the tub. Chlorine and bromine systems suit the 7-measure and 5-measure packs, while peroxide-based water care needs the peroxide pack, since each strip reads only what its pads cover.

Strip count matters as much as measures. A 150-strip pack lasts longer between replacements than a 30-strip bottle under the same routine, and the listing for one 100-strip bottle puts it at about 50 weeks of twice-weekly checks.

Reading method is similar across the packs: dip a strip for 2 seconds, wait 30 seconds, then match the pads to the chart on the bottle. One listing adds that results read best in natural daylight, and another asks readers to keep wet fingers out of the bottle.

Measures, counts and methods

The 7-measure packs cover chlorine and bromine systems in one dip, while the 5-measure pack covers the same systems with fewer readings. The peroxide pack covers one measure only, so it fits a different routine rather than a broader one.

Who should skip these strips

Skip the peroxide pack if the tub runs on chlorine or bromine, since it reads peroxide only. Skip the 5-measure pack if a cyanuric acid reading matters, since that measure appears only on the 7-measure packs.

For a full routine around these checks, the water care guide on this site walks through the same habits, from regular checks to draining and refilling on schedule.

Score notes

The Chill Score weighs performance, build and value most, with safety where it applies, and warranty. Here, performance covers the measures covered and the stated ranges. No listing states a safety certification or a warranty term, so safety and warranty sit at zero for all four packs.

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.

Merydi leads on count, AQUANEXO matches it on measures with full stated ranges, Clorox adds target bands and an app, and Elmoria serves peroxide routines alone.

Check Your Space First

• Keep each bottle cool and dry, with the lid tight and the desiccant inside.
• Keep wet fingers out of the bottle.
• Read results in natural daylight.
• Tuck the compact peroxide pack in a drawer or toolkit.

Common questions

How often should plunge water be checked?

One listing advises checks at least twice per week, or as needed, to watch water quality at regular intervals. A routine of regular checks catches drift early, before the water turns cloudy. Match the strip count to that routine, since counts run from 30 to 150 strips here.

What do 7-measure strips cover?

The 7-measure strips cover free chlorine, total chlorine, bromine, pH, total alkalinity, total hardness and cyanuric acid in one dip. That set suits chlorine and bromine systems, since it reads both sanitizers plus the balance measures. The 5-measure pack covers the same systems with fewer readings and no cyanuric acid reading.

Can peroxide strips check a chlorine tub?

No. Peroxide strips read hydrogen peroxide from 0 to 100 ppm, and they list no chlorine, bromine or pH measure. A chlorine tub needs a 7-measure or 5-measure pack instead, matched to the sanitizer in use.

How long does a bottle last?

One listing puts 100 strips at about 50 weeks of twice-weekly checks. Other packs state counts of 150 strips and 30 strips without a weeks figure, so longevity depends on how often the water is checked. Keep the lid tight and the desiccant inside so moisture does not spoil the strips.

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