OK -- When I first started opening my pool -- I put a CuLater packet in the skimmer. Not real sure of results tho... It is not there now - and I have metals. I Think we have attempted 7c -- dropping it to the bottom trying to use both Super Floc and Alum at different times -- but pool store had me lower the chlorine for both of these attempts - we raised the ph tho. Little results. Still can not see the bottom. Pool store is recommending changing out the Sand for ZeoSand. I had put 50lbs of zeosand in when I changed my 300 lbs filter just a week or so ago. But they are suggesting I put all zeosand. I have one more CuLater packet -- should I put that in the skimmer? What are your thoughts about the zeosand?