Pentair R151226 Cyanuric Acid Test Kit

Designed to accurately measure cyanuric acid (CYA) — also called stabilizer or conditioner — levels in pool and spa water, the Pentair Rainbow R151226 is a #79 Specialty Test Kit aimed at owners who want tight control over their chlorine performance. Holding CYA in the 30 to 50 ppm range is critical, since readings below 30 ppm leave chlorine vulnerable to rapid UV burn-off, while levels above 70 ppm significantly reduce chlorine's ability to sanitize the water. The kit pairs a slide-calibrated test stick with an 8-ounce bottle of melamine reagent (R-0013) to produce a straightforward positive readout — fill the test tube to line A with pool water, add reagent up to line B, mix the solution for 30 seconds, and read the result by looking down through the cloudy mixture until the black dot on the test stick disappears. The result is expressed directly in parts per million of cyanuric acid. Everything ships in a clear-top styrene box with complete instructions included.

Highlights

• Cyanuric Acid Readings in PPM: Combines a slide-calibrated test stick with Pentair's proven R-0013 melamine reagent to deliver a fast, repeatable cyanuric acid reading in parts per million, supporting the 30 to 50 ppm target range that keeps chlorine performing at its full sanitizing potential through routine pool operation.
• Positive Black Dot Readout: Rather than relying on color matching, the R151226 uses a positive black dot readout method — looking down through the reacted solution from the top of the test tube and noting the moment the dot on the test stick disappears — which makes the result easier to read consistently across lighting conditions and users.
• Generous 8-Ounce Reagent Bottle: A full 8-ounce supply of R-0013 melamine reagent comes with the kit, providing enough reagent for multiple pool seasons of regular cyanuric acid monitoring before replenishment is needed, which keeps ongoing testing cost low for both homeowners and service technicians.
• Helps Maintain Chlorine Effectiveness: Out-of-range CYA is one of the most commonly missed contributors to weak chlorine performance, and testing stabilizer regularly with the R151226 allows pool owners to spot drift early, adjust appropriately, and keep their sanitizer working efficiently throughout the swim season.
• Self-Contained Test Kit: The kit arrives complete with a test tube, slide-calibrated test stick, 8-ounce R-0013 reagent bottle, and detailed step-by-step instructions all housed in a clear-top styrene storage box, providing everything required to perform accurate cyanuric acid testing from the moment the package is opened.