Sparro

Hello; I just had installed the Apollo CPC Fiberglass pool. It's 16' x 38' and has a capasity of 17,500 gallon. It is a Salt Water system. My dealer brought me a Hayward C3025 Cartridge filter, but it seems kinda small for my size pool? It hasn't been installed yet, so I was thinking of telling him I want the Hayward C5025. Does anybody know which Hayward filter is best for my size pool. I also have a 1HP Hayward Super Pump II. Thanks.