Last night filled new above ground pool. Clear water. Today, tested water, plugged and chugged numbers in pool school calculator. Added bleach, borax, and CYA. Then about hour later the pool water turned green. Is this from the metals in the water? I joined Pool School last season with a different pool and followed the "seasonal pool set-up" using the shock method. I saw the set up used is a different this year but I followed it to the letter. Do I just need to purchase something that removes the metals from the water or did I screw something up? Thanks.