We have a couple pools where the TA was around 70 and the pH never moved then one day the TA is up at around 160. Could all this TA rise come from just fill water? I'm thinking it could be the baking soda in the Arm & Hammer Laundry Detergent? Maybe the swimwear is not being properly rinsed when washed or they are using too much Arm & Hammer Laundry Detergent?
What are your thoughts on this? I think I need to start charging for acid.