Thanks, watermom will try that, we ended up with that size pump and filter because our setup started out as a rec warehouse pool and the big blue sand fliter cracked, and our pump died, we the pump on ebay for a great price and found the sand filter on craigslist for an even better price. This is our 3rd season running this setup and although this is the first starting with this nasty of water, we have never had an issue. What would be better a smaller pump or filter? maybe 1 hp tops?