I have read this thread with great interest, since I have a 24 foor round AGP and have some questions about my sand fiter. Sounds like you are the people I need to talk to...

I have a Baquapure 2600 sand filter with a 2.5 hp pump. I don't seem to have any leaks or air issues, but I just have this feeling that my filter is not working as well as I think it should be. I backflush like you decribed above (a couple of minutes, till outlet water is clear) a couple of times a week, but my gauge always seems to hover around 19-20 psi. I replaced the sand last summer, but have had a lot of algae problems this spring (we live in Florida, so the algae starts blooming in about March). What pressure should the gauge read in normal operation? If it is higher than it should be, what is the proper drill to get it back in the right range?

Thanks for any help you can offer.

Justin Harlow