Last year was my first using salt in my pool. Everything worked and looked great, thanks to all over your helpful comments. I am starting my pool opening today, the cover is removed and the water is crystal clear. I am trying to find out how to: Test the salt level in the water so I can determine how much I need to add to ensure another clear water pool. I have an above ground 21 X 4 pool. I hope I have given everything needed to help me restart and check my salt levels.