2-in-1 OTO & Phenol Red Refill Solution for Drinking Water, Alkaline & Hydrogen Water Machines, Pools & Spas, 100 Tests, USA Swimming-Approved Accuracy

🧪 TWO REAGENTS, ONE COMPLETE TEST — Includes OTO reagent for Free Chlorine and Phenol Red reagent for pH — the two core measurements for verifying your water is properly sanitized and balanced, whether it's tap water, well water, alkaline water, hydrogen-infused water, or pool water. 100 tests per pack.

🧪 ACCURATE RESULTS IN SECONDS — These reagents produce a clear color-change reaction you can read immediately, giving you fast, reliable chlorine and pH levels without sending a sample to a lab or waiting on results.

🧪 VERIFY YOUR ALKALINE OR HYDROGEN MACHINE IS WORKING — Confirm your alkaline water machine or hydrogen water machine is actually raising pH as intended, so you know you're getting the water quality you paid for — not just trusting the display.

🧪 THE SAME CHEMISTRY THE PROS USE — Formulated with the same reagents approved by USA Swimming, so the accuracy you get at home matches professional-level water testing standards.

🧪 VERSATILE FOR ANY WATER SOURCE — Delivers dependable Free Chlorine and pH readings across drinking water, well water, alkaline and hydrogen water systems, and freshwater or saltwater pools and spas — one reagent set, multiple uses around the home.

🧪 UNIVERSAL COMPATIBILITY — Works with any brand of OTO 2-in-1 liquid test kit, not just one manufacturer's device. Reagents naturally lose potency over time, so refilling regularly keeps every test accurate.

Description

Accurate water testing starts with fresh, reliable reagents — and this 2-in-1 refill pack gives you exactly what you need to test Free Chlorine and pH with confidence, whether you're checking drinking water, well water, output from an alkaline or hydrogen water machine, or your pool and spa. Each pack includes an OTO reagent for chlorine and a Phenol Red reagent for pH, delivering up to 100 individual tests.

If you own an alkaline or hydrogen water machine, this is also a simple way to confirm it's performing as advertised — verify the pH shift for yourself instead of relying solely on the machine's built-in readout.

Formulated with the same chemical reagents approved by USA Swimming, these reagents produce fast, clear color-change results in seconds — no lab, no appointment, no guesswork. They perform consistently across water types, from household tap and well water to alkaline systems, hydrogen water machines, and freshwater or saltwater pools, and they work with any brand of OTO 2-in-1 liquid test kit, so you're never locked into one manufacturer.

Reagents degrade over time and lose testing accuracy, which is why refilling regularly matters just as much as the test kit itself. Keep your test results trustworthy with reagents made to the same standard professionals rely on — for the water you drink, the machine you invested in, and the water you swim in.

Accurate testing. Every water source. Every time you need it.

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