I am new to the pool world and just purchased a coleman 18' x 48" pool that comes with a cartridge filter and I want to upgrade to a sand filter. I am looking at the 12" intex sand filter that has a 0.3 hp pump and is rated for 2800-12800 gallons of water. Or I could go up the 0.6 or 0.75 hp pump with either a 14" or 16" sand filter that are rated for a minimum of 5500 gallons. The pool at 90% says it holds 6090 gallons. Is the 0.6 or 0.75 hp pumps overkill and could they cause any damage to the pool?