How To Reduce Alkalinity In Hot Tub Water. To raise ph more than alkalinity, use ph increaser, with the spa pump on. You should, therefore, aim to keep the total alkalinity readings above 80 ppm.
Let the hot tub sit for 6 hours before you retest. Test your hot tub’s alkalinity level at least twice per week, with a test kit or strips. You can either use sodium bicarbonate (baking soda) or alkalinity increaser.
Both muriatic acid and sodium bisulfate will do the job, and it’s up to you to weigh the pros and cons of each.
To lower the ta 10 ppm, 0.43 lbs. Retest for total alkalinity and adjust if needed. Unbalanced alkaline levels and ph can decrease the life expectancy of your hot tub and lead to costly issues down the road. It’s important to monitor the total alkalinity levels as the ph increaser will raise the ta level.