IG ,diamond brite plaster, 2hp DE , 3/4hp vacumm ,18,000 gallon ,2 skimmers.... I have inline chlorinator .... I only run 2hr morning 3 hr evening . longer on weekends.... I have been adding an algeside from home depot says 3 X the stregth...3-4 oz every few days... Moss rock fall and 2 inserts.. I was the GC