We are building a new pool, about 17,000-20,000 gallons (not sure on the exact size but will be between those numbers) with a vinyl liner. The pump we will be using a 1.5 HP Hayward SP2300VSP Max-Flo VS Variable-Speed and we are wondering what size, brand etc. filter to get? We'd like to use a cartridge filter and I'll be doing the BBB method of pool maintenance as I'm a chemist and think I can handle it. Thanks for any input!!