Hello!
I should do a search but I am going to be lazy and just ask for some advice on pro's and cons of each!

I have a 10K gallon Lomart pool with a Spectra 3 sand filter. I was doing a search for something completely different and came across a post that the person gave advise and said they would get rid of the sand filter and get a cartridge filter! Is a cartridge filter better? I always thought sand filters were the way to go. I have never had any problems with mine, water looks better every day, considering I do basically nothing to the pool except once a week! So any thoughts!! Also would like to know how often you should change the sand in the filter! I guess I am on my 3rd season, I am still using the original sand, should I change it soon? I thought before I heard 5 years?? Thanks!