Poolmaster 23225 OTO and Phenol Red indicator bottles for chlorine and pH testing.
Replacement indicator solution bottles for spa and pool pH checks with Poolmaster.
Front view of Poolmaster testing kit used for quick water chemistry checks.

Poolmaster

Poolmaster 23225 OTO & Phenol Red Replacement Indicator Solutions – 1/2 oz for Spa & Pool Testing

High-performance patio lawn and garden made for confident daily results

$13.56

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Why customers choose PatioZora Garden

Overview

Keep pool and spa water balanced with Poolmaster’s replacement indicator solutions. This 1/2-ounce kit focuses on two color-changing indicators that help translate chemistry into easy-to-interpret visuals, supporting you in deciding when to adjust sanitizer or pH between full tests.

What’s included

  • 1/2-ounce OTO indicator solution for chlorine testing
  • 1/2-ounce Phenol Red indicator solution for pH testing
  • Notes on interchangeability and transport safety included with the kit

How to use

  • Collect a clean water sample from the pool or spa in a test container.
  • Add the OTO solution and compare the resulting color to your chlorine color chart.
  • Add Phenol Red and compare the color to the pH reference guide.
  • Consult your chart or instructions to determine whether to adjust sanitizer or pH levels.

Important notes

  • Phenol Red in this kit is not the same as Solution #2 Phenol Red; do not interchange.
  • Solution #1 is shipped sealed to comply with transport regulations; other solutions generally do not require sealed caps.
  • Suitable for home maintenance, quick checks between more detailed tests, and routine water care routines.

Why choose Poolmaster

Poolmaster has a long-standing history dating back to 1958 as a trusted maker of aftermarket pool and spa products. Their commitment to quality, service, and reliability shines across multiple product lines, making maintenance tasks more approachable for everyday users. This kit aligns with that heritage by offering straightforward indicators designed for calm, confident water testing.

Helpful usage notes

  • Pair these indicators with your usual testing routine for a quick check between deeper analyses.
  • Store in a cool, dry place away from direct sunlight to preserve color accuracy.

FAQ

Q: What does the Poolmaster 23225 kit test?

A: Uses OTO to measure chlorine levels and Phenol Red to indicate pH in pool or spa water.

Q: Are the Phenol Red and OTO solutions interchangeable?

A: No. Phenol Red in this kit differs from Solution #2 Phenol Red; interchange is not advised.

Always read and follow the product label. Dose to the label rate for your actual water volume, never mix pool chemicals together, and store them dry, sealed and away from children and pets.

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