No Drain Pool Acid Wash | InTheSwim Pool Blog
Jan 26, 2018·If your pH is 2-3, maybe just a 4-6 hours is sufficient, but if the pH is higher at 4-5, maybe a 36-48 hours. Your test kit will not test at such low levels, but you can use online tools like poolcalculator.com to determine the exact amount of dry or liquid acid to use, to bring the pH to a specific level, for a specific amount of water.