had this house and pool almost twenty years. never had to worry about the pool. gaseous chlorine made my life easy! Then the regulators took it away and I have been being abused by pool "Professionals" since, about three years now. always green now unless I drop two or three hundred in chemicals then its good for about a month! then start over. A certain local pool store had a worry free guarantee, but strangely never came thru on the guarantee. I was always missing a crucial step, so guarantee void! but keep coming in and buying more chemicals! I am done! I bought an aqua guard complete test kit and a lot of online research. And I'm taking my life back! (I hope) no where to go but up! Or I can fill it with dirt and have a garden!