Advice about changing over from using the Intex cartridge filter pumps to a standard above ground sand filter. What size pump do I need for 10,400 gallon Intex ultra frame pool? I have a sand filter from an older above ground pool I was planning on using with it, will that be ok? How do I know what size pump and sand filter is appropriate? One of the reasons I want to switch is so I can effectively vacuum the pool, I did not have luck with trying to vacuum since the pool has 2 outlets that combine to go to the pump. I have problems with leaves and field dust, etc and am hoping to do better with it next year.