I've been struggling with what I think is pine tree sap in our pool for a while now. The filter can't seem to get it out so I've gone through 2 bottles of floc, waiting 24 hours after each one and vacumming to waste. Each one helped, but once the gunk on the bottom is stirred up with the vacuum, the filter can't seem to get it out, so I have to let it settle and vacuum again. We've cut the trees back quite a bit (pine tree hanging over pool - not our idea, bought house that way ) but I can't get the pool clear. Is there something else we should be doing?