I am looking at changing over to filter glass. I have a hayward s200 filter. can I do all 1 size of glass of do I need coarse and fine? I know Dr. drydens has 2 levels of grain size. But it is VERY expensive and it is the only one that i have seen that mentions 2 different sizes.

I am very much a novice, But I try to do a lot of research before I make a decision.

Thank you