Thanks,

I thought it might be algae as well at first but I'm not so sure now. When I opened I put in 5gal 12.5% brushed the sides, vacumed to waste, then opened the filter, cleaned the grids. Works for two hours. Next day repeated the above minus the 5gal. Works for two hours. Next day another 5 gal vacum to waste, clean the grids (which were not green at all) and then worked for two hours. Daily after that cleaned the grids, let run.

Algae was my first thought as well but it's never taken this long to clear in the past, (first time when we bought it and another when the squirrels ate through the cover). I am on my way to the local pool store to get some fresh chemicals for my testing kit and will post those asap.

I have been around this forum for a while but this really is the first time I have had problems, the help in a friendly manner that everyone gave is really appreciated.