I bought a very small AGP recently. Just after my basic test kit arrived (Cl, Br, pH) and before I filled my pool I tested my tap water and it came in around what I might expect 1 or 2 Cl and 7.8 pH. Two weeks later I am finally ready to fill my pool and after I get it all filled, I test the Cl and pH and get essentially zero Cl and pH that is above 8.2. Is this possible? To be sure I checked the straight from the tap and am getting the same as I am out of the pool (high pH and low Cl). I am most worried about the pH. I used the pool calculator and added bleach to get where I wanted to be but I blew it on the pH front. I thought I was following the instructions on the pH decreaser (sodium bisulfate) but apparently I added too much and now the pH is below 6.8
So my questions are, is this possible/normal for city water to change so much and have such a high pH?
Also, should I now add Borax to get the pH back where I want it? Or should I just replace water?
Soon I am going to be adding Dichlor (for Cl and CYA, it is in the mail due to arrive in 2 days) which will also decrease my pH. Will all that Borax cause other problems?