R151226 | Pentair Cyanuric Acid Test Kit

The Pentair Rainbow R151226 is a #79 Specialty Test Kit designed to accurately measure cyanuric acid (CYA) — also known as stabilizer or conditioner — levels in pool and spa water. Maintaining proper CYA levels between 30 and 50 ppm is critical to chlorine performance, as readings below this range accelerate chlorine loss to UV exposure, while levels exceeding 70 ppm can significantly reduce chlorine's sanitizing effectiveness. The kit relies on a slide-calibrated test stick and an 8-ounce bottle of melamine reagent (R-0013) for a simple, reliable positive readout — fill the test tube to line A with pool water, add reagent to line B, mix for 30 seconds, and read the result by looking down through the solution until the black dot on the test stick disappears. Results are expressed directly in parts per million of cyanuric acid. The R151226 is packaged in a clear-top styrene box with complete instructions included.

Highlights

• Accurate Cyanuric Acid Measurement: Uses Pentair's proven melamine reagent (R-0013) and a slide-calibrated test stick to deliver a fast, reliable cyanuric acid reading in parts per million, helping pool owners hold the ideal 30 to 50 ppm stabilizer range that supports maximum chlorine efficiency throughout the swim season.
• Black Dot Positive Readout: The unique black dot readout method removes much of the guesswork from CYA testing, asking the user to look down through the cloudy solution from the top of the test tube and note the moment the black dot on the test stick disappears to obtain an accurate, positive cyanuric acid reading.
• 8-Ounce R-0013 Reagent Supply: Ships with a generous 8-ounce bottle of R-0013 melamine reagent, providing enough supply to cover multiple pool seasons of routine cyanuric acid monitoring without requiring frequent reagent replacement, which keeps total cost of testing low over time.
• Protects Chlorine Sanitizing Performance: High or low CYA levels are one of the most overlooked causes of poor chlorine performance, and regularly testing and adjusting stabilizer levels with the R151226 helps ensure chlorine continues to sanitize effectively so pool water stays consistently clear, safe, and properly balanced.
• Complete Kit Ready Out of the Box: Includes the test tube, slide-calibrated test stick, 8-ounce reagent bottle, and step-by-step instructions packaged together in a clear-top styrene storage box, providing everything needed for immediate, accurate CYA testing the moment the kit is opened.