I actually have a filter dilemma....currently useing a Hayward Pro series s210t filter and have been told by many "pool" people that I will need to upgrade to a cartridge filter.
My current AG pool is 10k gallons and the pool I am having installed next week is a 27' round @ 18,5k gallons. According to the flow rate of the filter @ 20 gpm ....and the flow rate of my Pentair superflo pump @ 84 gpm, I'm a bit confused if this system will be ok.

The sand filter has always kept my water clear as far as I can tell.....I like the idea of a cartridge filter...less maintenance , more flow(turnover) etc...but not thrilled at the replacement filter prices.

Currently I have a line on a Jandy cl580...which was running a 40k gal pool .

I hate to spend $$$ thats not necessary but want a good system for my new pool.

any help or insight is appreciated

I appreciate the help