My home warranty recently upgraded my single speed pool pump to a V270 Green variable speed pump. My pool is about 18,000 gallons in ground with a skimmer/floor intake and an automatic cleaner intake and 2" piping. There are no water features. I typically run an automatic Hayward Navigator Pro floor cleaner. Currenlty, I have a Sta Rite 3 S7M120 that is old (pool was installed in 2004 and housing is cracked). I would like to change to a sand filter. I have researched on inyo to learn about sizing requirements, but I still don't know how to size a sand filter system to a variable speed pump. The sand filter I am looking at is the Hayward S224T. I want to take advantage of the savings from the variable speed pump. Is this sand filter a sufficient size for that pump?