Check₂O Pool & Spa Alkalinity

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Check₂O Pool & Spa Alkalinity 0 - 40 - 80 - 120 - 180 - 240 mg/L as CaCO₃ Total alkalinity refers to a number of chemicals that are present in swimming pools which are able to prim arily resist any sudden changes in pH. These chemicals are usually carbonates, which is why alkalinity is sometimes called carbonate hardness. The total alkalinity or carbonate hardness of a swimming pool should be kept between 80 - 120 ppm. Low levels of alkalinity can lead to big swings in pH whereas levels of alkalinity that are too high will consequentially cause the pH to be high also. Show more