I have a Intex 18 X 42 that I got last year for fathers day. I drained it last year and stored for the winter and we got it out and filled it about 10 days ago. I put in about 130 lbs of salt and now the water is green. I just use the color test strips from HTH. I filled it with city water and our water is very hard. The ph appears to be about 8 and with the test strips I'm having a hard time gettting a control on the Chlorine level. Is it possible that my SWG is not working and how do you tell if it is? It's a Intex model designed for this pool. I use the cartridge filter system. I really enjoy my pool but I'm sick of friends telling me a pool is too much trouble and to get rid of it. Help me prove them wrong. Thanks in advance. Ty