Hi! I have a 33,000 gal pool with two 2 hp pumps for pool, spa, and overspill. I purchased an E5 Zeolite filter with 300 lbs of Zeolite a year ago. I backwash a lot. I have room to add a second stage filter such as a Zeolite Antibacterial Cartridge, light or whatever. I would like to clean up the persistant algae and cloudy water. I run a Dophin Supreme M4 several times a day and brush the pool. We have a pool guy. The pool goes green easily in the San Diego heat. Any ideas? Thanks!