How To Adjust Alkalinity In Hot Tub. To raise the ta 40 ppm or 0.70 lbs. Then add 100 gm, 4 capfuls of spa shock to the water to regain water transparency.
Make sure your water hardness is not too low. Baking soda (sodium bicarbonate) is an extremely common way to raise alkalinity in a hot tub. In fact, it’s so common that products such as alkalinity increaser or alkalinity.
Baking soda (sodium bicarbonate) is an extremely common way to raise alkalinity in a 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. For 30 ppm, use 0.42 lbs. Retest for total alkalinity and adjust if needed. In this way, what causes high alkalinity in hot tub?