I have a Hayward system, large pump, older IG pool with new vinyl liner. This is our third summer in this house. I opened late this year and had to fight a lot of algae, hence a lot of backwashing. Early on, my pressure gauge was reading normal, maybe a little low compared to the last two years (replaced the pressure gauge last summer). Now it is hardly showing any pressure at all! At first I thought it was just the gauge gone bad, which it could be, but my returns are not putting out as hard as they used to, so something isn't right even if the gauge is bad. My vac still works pretty well, though. I thought I had read on here once that low pressure might result from loss of sand in the filter - and that sand needed to be replaced every so often. I don't know if it ever has been. I don't really trust the pool place folks enough to call them out to look. Can someone advise me on this, and tell me HOW to change the sand? Thanks!
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