Quote Originally Posted by bri3180 View Post
I have been cleaning the filters at least once a week. 35,000 gallon pool w/ 4 filter elements and the pool is 5 months old. Before I gave a 50/50 part muriatic bath, the psi would go no lower than 30 psi. After the bath the psi was 15 but worked its way back to 20 within a few days. Could you please tell me what the first thing to clean with is? Thank you. Brian
My question is why is the filter run cycle so short? You should not need toe cleaning the carts once a week or more!
Either your carts are gunked up (from acid washing before degreaging them--unlke PoolDoc I have seen this occur and can confirm this), there is an abnormal amount of 'crude' in your pool being filtered out (such as plaster dust from curing plaster or a constant algae problem), or the flow rate might not be correct (a pump issue). I would be interested in seeing a full set of water tests.