Ok, my water has been kept on SLAM level for 19 days now and is still bright green. We can see the bottom of the pool but it is green . On my other post it was mentioned by chem geek that it could be iron in the water. I had actually had the water tested at the pool store and asked specifically to test for iron and copper. The lady ran a test, did a printout but it didn't show anywhere on the test printout so I asked if there were metals. she said oh...no metals, it just didn't print. I am now thinking maybe she didn't test it at all? Also when I uncovered the pool this year it was very dark green, on clearing I found a large orange colored rock in the middle of the pool ( thinking grandchildren threw it in) could that have added metals to the water? We have never before had metals but the pool is clear green.