Sorry if im such a newbie here but.. I opened up my inground pool for the first time, just bought the house. Pool was BLACK. I believe it was neglected for at least a year. Got it to a milky blue/white right now, but there is a problem with my DE filter.. (I think its the filter). Upon a fresh start up with new DE the returns shoots out strong and the suction at the skimmers is ok, but within a hour the returns are barley pumping out and there is minimal suction at the skimmers. If i back wash and start up again, same thing happens with in a hour. Please let me know your opinions. Thank You. - Jim