Hey Carl, thanks for your fast answer! I use the 3.-in 1. chlorinating skimmer tablets in the floater, I shocked it on Monday with Super shock n'swimm and my test is the 4-way strips from Walmart everything is from HTH. I did not tested our fill water but I know we have very good water quality! What is a baseline??? I go in the pool every day with my 4 years old and the water is really really clear. Maybe we just have a miracle pool LOL