Quote Originally Posted by calamtykel View Post


the pool store suggested that I add a lot of PH lower to get the alk down, however, I have a big problem with Low ph in my pool and finally just got it within acceptable range! I am hestitant to add ph lower as i know shock needs a relatively high ph to work effectively.
First of all, where did you ever get the mistaken idea that shock needs a high pH to work effectively?
Second, I am going to make a guess that you normally chlorinate with trichlor tabs and shock with dichlor. Both of these will cause both the pH and TA to fall.
The only other thing that can cause a low pH problem is keeping the pool covered all the time. This could also lead to persistent CC!
Let us know which of these scenarios applies to you and we can take it from there.