Quote Originally Posted by dustybecca
Is there a formula for how much acid to add and how long to wait before adding more?
Bleachcalc will do acid too. I usually wait 4 or 5 hours before retesting. Better to sneak up on the right reading than to blow past it at 70mph. I don't even retest everytime anymore. I know what a quart of acid will do, so I just add it and wait.