I'm looking to ditch the cartridge filter that came with my pool. I have been dealing with a green pool for 3 weeks now and mine just isn't clearing it. I have been keeping the chlorine level high. Currently I am SLAMMING it. 3 days of 24/7 running my filter and it hasn't changed a bit. Any recommendations on a good filter for a 18x48 Ultra frame intex pool that won't cost an arm and a leg but will clear my pool?