Check your PH level and you might want to backwash the filter after 4 or 5 hours and then let it run for another 4 to 5 hours. Also add some water clarifier and vacuum when all done. Backwash filter again when you are all done with that too.
BEEN threw the same thing some years back. HIGH-LOWS, GREEN ALGE, CLOUDY WATER. my buddy came over with some HTH ,
the next day BAM clear as glass. been that way for YEARS NOW. NO more FUSSING w/ anything.
GOOD LUCK GOOD PLUGGIN