As of right now, all I can test is the PH and FC. My FC is 4 and my PH is 7.5. I have the HTH strips, but don't trust them because of the issues I had before. I am going to take a sample to Leslie's later and see where it's at. It's just frustrating because last week the pool was blueish but was just a little cloudy. I didn't do anything different far as making sure my FC and PH was good. I'm sure I need to go ahead and replace the filters at this point because they are almost 3 weeks old. I'm looking into getting one of those rinz n reuz setups. All the reviews and such look good and for $30 shipped, I'm willing to try it out.