Need some help sizing a filter for a large 55k pool. The pool has two skimmers and one side return, no main drain. All plumbing is 1.5". Currently this is feeding into a new hayward 1.5hp super pump. The current filter is an old 72 sq ft DE filter. Would like to switch to sand and was suggesting a hayward 310S to him. It seemed like the pump would not have sufficient flow for the 316. Would this be a good fit? If not, can someone make some recommendations?