We had a wetter than normal winter and had to drain water out of our mesh-covered pool several times in order to keep the water level below the tile line. We opened up our pool yesterday and it was much greener than usual and there was no CYA in our pool. All of the rain also severely lowered our calcium level and salt level. I had a bottle of Natural Chemistry's Liquid Conditioner in my utility room that I bought last fall and added that to my pool. If my CYA level is truly 0 like the test seems to indicate, the liquid conditioner should have got the level to 19 according to the pool math calculator. I retested the CYA level a few hours after adding the liquid CYA and I still see the dot at the 30 mark so I assume the CYA is still below 30 or it is too soon to test. I'm wondering if it would be okay to start the SLAM tonight even though my CYA is probably still slightly below 30, or if I should SLAM it a few times with Dichlor instead of bleach which will add some CYA to the pool. I'm going to have to get my CYA level up to at least 60 eventually since I have a SWG, but I just want to get the level to 30 right now so I can do the SLAM.