Pool looks good, I have the test kit I bought from TFP and everything except for my acid level is checking out good. I've been adding about 3/4 of a gallon a week for the past 3 weeks. Yesterday, I added a whole gallon around 6pm, then today I checked it and it's still in the dark purple range of 7.8 to 8.0. My buddy has a similar sized pool (both are salt water if that matters) and he only adds about 1/2 gallon a week. Any ideas on what could be going on? Thank you!