Waterbear--my apologies...I must have read waterbearer in my haste

So yesterday around 6pm I added a half box of borax. I can already see further down past the ladder than I did yesterday. About 5 minutes ago I tested pH and chlorine:

With the shot glass method I had to do 2 shots of distilled water and 1 shot pool water. With that I got 5...making it 15

For pH it looks to be about 7-7.2

Also, how much water loss/evaporation should I be experiencing each day? From yesterday to today we lost about an inch. Yesterday was about 90 degrees. We’ve been in the upper 90s-100 all week. So is this normal?