Pool
Arm & Hammer pH Boost — Professional Pool pH Booster, 39.6 lb (6-Pack)
A granular pH increaser sold as six recyclable 6.6 lb boxes (39.6 lb total). Made from sodium carbonate monohydrate, it’s formulated to lift pH into the 7.2–7.8 range, reduce eye and skin irritation, and help prevent staining, corrosion, and scale in spas, swim spas and small pools.