I would seriously consider the sand filter from Intex, you could do a Hayward too. They have some AGP models.
The 2650gpm unit is about $180 shipped on Amazon last I checked about a week ago or less. For your size pool you would be fine with the 1600gpm model, which is close to 100 bones, but it isn't as well suited for suction side vacuums as well as slower turnover of the water, thus you have to run it more to filter the same amount. Sand filters aren't perfect, but Intex's units are MILES better than their cartridges, not Hayward cartridges and the like, and for day to day use, they'll keep your pool sparkly clean so long as you keep it balanced.
They have trouble clearing a swamp or cloudy water as fast as a high SqFT cartridge or DE filter, but those also cost many, many times more than the sand filters do. You can always add DE or cellulose fiber to your sand filter to help clear up the water or 'polish' it if you'd like.
You loose water to backwashing, but for some people that's a good thing, as it keeps their CYA in check so they have the option to use pucks when they're gone on vacation.
Or you could do what I plan on doing and that's hooking a 1micron filter bag up to the discharge hose and sending it right back into the pool. HEHE
Do not get the SWG all-in-one unit, if you're going to do that, get it separate, Target has them for $99.xx right now. But then again, I now see you have one. Soooo, NM.
You should disconnect the copper electrode though, it just creates problems. Copper ions are a good concept, as they have algaestatic properties, but they're sooo slow at killing algae, that in practice it's just not worth the problems, green hair, water, etc...
Use borates instead.
Hope you make out OK, any further questions, hit me. Sorry if I have been a bit slow to respond, got the Flu today.
