Ok i have tried every thing and still my paper cartridge filter clogs up every 15 to 20 minutes, i was so frustrated until i used my noggin and took the filter out put panty hose around the basket in the skimmer and it actually catches all the small particles just as good as the paper cartridge and greatly improves the flow on the pump too. I will keep doing this until i can get a good sand filter. If you guys have any idea how to help please do.