Got back from vacation and my pool was a mess. Shocked it and the water is now blue and very cloudy. I tried to put in some DE (in a bucket and mixed with water) I saw the cloud of DE coming back in the pool I think there may be something wrong with the filter because it makes noise when I shut it off or when I switch to backwash, like the filter and all of the pipes are draining. Sometimes there is a bubble at the top of the pump basket that goes away after I let the filter finish all it's noises I hate to call a pool store to have them come out, but I will if I have to Any suggestions?