I've had an Intex 18ft pool for 3 years and never had such a hard time opening it. I finally got everything balanced according to the pool store, but water was very cloudy to the point you couldn't see the bottom and now is cloudy and green. Upgraded this year to a larger sand filter. I started the SLAM last night and when I checked this morning the FC was 10 and CYA was 20. I put it in the app and added more shock per calculator. Not sure I'm doing this right or even using the app correctly because the numbers aren't changing on it. Pool looked the same this morning as last night.