by Brenmar » 10 Nov 2016 12:14
You may have been better off putting this in the swimming pool section, but here goes.
When did you last backwash the pool and when did you last change the sand in the filter?
Also, when you clean the pool, what do you have the multi-port valve set on?
You have dirt cycling back into the pool, so it looks like it is either passing straight through the filter, or is bypassing it altogether.