It's time to replace the two sand filters on my indoor pool and spa. They are old, leaky, and since this is an indoor system, I feel that a cartridge or DE filter would be more appropriate. There is not a lot to filter out.
That being said, the only experience I have is with sand filters, and I know very little about the other types.
The pool and spa are on separate systems, and they will each have their own Hayward EcoStar pump. Currently, they both have the same model sand filter, a 26" diameter, 3.5 sq. ft filter area sand filter. The pool is around 15,200 gallons and the spa is around 700 gallons.
I'd love to hear some opinions on DE or cartridge types and model recommendations. Any special considerations for the spa? I am not opposed to having a totally different type of filter on each system.
Thanks for your help!