Glad I found TFP. Although the 2 pool stores tried to help me, it didn't work. Ordered my Taylor test kit, be here in a few days. Gonna tackle this myself and with the help of you fine folks! First time in my 20 years I lost my pool. It's always been pucks in a floater and the occasional 3 lb powder shock after a monsoon storm. Never has went green on me before, so I've been lucky! I'm waiting for the test kit before I waste any more $$ on chemicals. After 3 bottles of algeaside, 12 gal. of liquid chlorine, (not all at once) brushing and running pump, it's gone(with the wind). I know I have to do the SLAM, question is, what to do now without any more $$ spent...can't get any worse, CAN IT?? 20,000 gals/in ground 1 hp heyward 240 sand filter