Well I have a four winns spa that has been a nightmare since it arrived on my door step but that is another story. It is about 450 gallons and seats 6 comfortably. I use the soft soak products and I am concerned that I'm always "relaxing" with floaties and lots of them. The filter doesn't seem to pick up squat even after it is cleaned thoroughly. Now even if it hasn't been used I get this disgusting brown sticky like gue sludge that keeps appearing on the water line. I'm very embarassed to open it because I never know if it will be clean or not, even if I just cleaned it. The test strips seem to be in level so I just don't get it. How do I keep this thing clean? Dang my pool was easier than this! Oh yeah I've had it 6 months and already drained it and washed it all out.