Valterra Blue Devil 1 OTO | 32 Oz.| B7510 Hayward H-Series Bypass Valve this float valve offers long-term

this float valve offers long-term durability and dependable operation in harsh pool environments

25 horsepower

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even in demanding pool environments

Total Chlorine

Valterra Blue Devil 1 OTO | 32 Oz.| B7510 Hayward H-Series Bypass Valve this float valve offers long-termThe Valterra Blue Devil No. 1 OTO Chlorine Level Indicator is a 32 ounce reagent refill designed for use with Blue Devil Test Kits to measure chlorine levels in swimming pools and spas. Regular monitoring of chlorine is essential for maintaining water quality and ensuring a safe swimming environment. To use, follow your test kit's instructions by adding the OTO solution to your water sample and comparing the resulting color to the provided chart to