Frequently having to backwash when opening

[dfresh4130]

Hey All,

I just opened my pool today and this is my second year doing so. It's an in-ground L shaped pool, 25K gallons, chlorinated with sand filter. The water had a lot of algae growth already. The problem I'm running into is that I'm having to frequently backwash it to get my circulation going. It'll go maybe a couple hours before I lose my circulation pressure. Once I backwash it it's fine again for a while. I already put a bottle of algicide into the pool and shocked with chlorine. I don't want to keep losing the chemicals I just put in by backwashing it so much. Is there anything else I should do or is this just normal for opening a pool. I read in my filter manual that chemical cleaning of the filter is needed occasionally. Could this be something I need to do? The pool is only about 4-5 years old and sand has never been replaced. Thanks

[SteveM1800]

I believe that you need to keep backwashing, but sand in a sand filter should be replaced every 4 to 5 seasons so it is possible that you need to replace it with new sand