De Backwash Water Not Turning Clean, Possible Pressure Issue

[Pltybx]

So I've had my new (to me) home since April at which time I had all the DE grids replaced as they were crushed and for the most part everything has gone okay. Pressure is holding at 10lbs since replacing the grids.

Then this week the pressue was too low and found that maybe my impeller on the motor was clogged so I disconnected the pump and removed the face and difuser and found some gunk, pine needles and even a small peice of stone was in one of the impeller vents. reconnected the pump, primed it and turned it on and the pressure returns to 10# and sounds nice steady.

Since I'm out I decide to backwash the pool. I unroll the hose to the lawn and make sure the valve is positioned to backwash and turn on the pump. water starts coming out. The water is dirty as expected but at least 20 minutes go by and it's not getting much better. Is this normal? It had been about 2 months since the last backwash. Needless to say, the level of my pool water got low enough to where the skimmer wasn't filling up fast enough consistently pressurize the hose. I ended up stopping the backwash and just added some DE to the skimmer just in case and went back to normal SOP. Pressure is good at 10#. So like I asked, is this normal for the water to be so dirty for so long?

Also, my pressure hasn't risen like I though it would from the pool being so dirty. I do clean the pump skimmer basket at least 3 times a week so I don't know. Thanks.

[PoolGuyNJ]

20 Minutes is excessive to wait for backwashing. I can see it happen with a variable speed pump on low and a big filter.

What model and brand pump and filter?

Scott

[Pltybx]

I'll have to check on that. It's an A.E. Smith or something like that.