Can someone please help? We have a 22x52 Coleman pool and are wanting to upgrade to a sand filter. I have found one online that is a 1,500 gallon that says it's for pools up to 11,200 gallons. I called Bestway customer service to verify that's what I need and they told me I needed a 2,500 gallon for my pool but it was out of stock. I don't find anything of there even being a 2,500 gallon sand filter by Bestway. The filter that came with my pool was 2,500 gallon but it's not a sand filter. Is the 1,500 gallon one sufficient for my pool size?