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Adjust ph, alkalinity, and sanitizer as needed three times a week; The three days will allow the pool chemicals to adjust the total alkalinity of your swimming pool. Household Defoam Substitute for a Hot Tub Tub, Cool The correct level of alkalinity. How to adjust alkalinity in hot tub . It also causes the water to be corrosive, which affects the metal fittings in your hot tub, and this can result in discoloration of the water. How to raise low alkalinity in hot tub. To raise alkalinity by using baking powder, add one tablespoon of baking powder per every one hundred gallons of water in your hot tub. To raise the ta 40 ppm or 0.70 lbs. Total alkalinity is so important to your water balance, the first step in your water care process will always be measuring and adjusting ta before any other chemicals. Baking soda (sodium bicarbonate) is an extremely common way to raise alkalinity in a hot tub. If your ph is low, you need to add a ph plus to increase these levels. M...