Hi my name is Debby. We bought a house last year and inherited a pool. It's an above ground 24x4'4" Intex. It uses a saltwater filter. I have been adding a bag of salt one at a time then testing 24hrs before adding more. I've so far used 4 40lb bags. It has gone from dark green to now looking almost more blue so I think I'm getting there. I would like any input you could give me. I have just a few test strips and here's the readings I have... ppm free chlorine is 0.5, ph is low 6.8, ppm total alkalinity is low 40. the copper is 0.5. I've read that I need to get some better test strips at Wal-Mart. Could you tell me what the name brand is? I just need someone to walk me through this because I know nothing about a pool. Thanks so much for this website.