My pool water has turned green. I had this problem before because of well water. I fixed the issue using a couple of white socks on the return hose and it caught all of the metal that was in the water. The socks looked like complete rust within minutes. So I tried again with the socks. I had them on for over a day and the socks still are nice and white. There is no algae that I can feel on the sides or bottom what so ever but the pool water is still green. We installed a pool heater that goes up on the roof and is heated by the sun. Because of the heater being so high I needed a bigger pump. I installed the new sand filter and pump and everything has been running great. The last time I had the green water it was on a small cartridge filter type of filter. All of my levels on the test strip seem to be ok now but this morning the chlorine was very low. I shocked the water and now all levels seem good. I was also told to use Ultra Bright Advanced by my local pool supply store but so far there is no difference. Not sure what to do or what going on now. I have searched and searched for answe