Filter sending dirty water back into pool

[davidsizer]

I would love to know if you resolved this issue and how because my de filter is doing the exact same thing... shooting algea into my pool for about 30 seconds immediately when i turn it on... then clear. Happens every time I turn it on and it gets more every time. Husband is a CPO and says chems are fine. He says it's normal until the earth had a chance to stick but it's been over ten times of turning it on now and this.

Hi, did you manage to figure this out? I am getting a similar problem when i restart my filter - perhaps a little less dramatic than your photos but certainly some plume comes out for 5-10 seconds on restart then back to clear. This usually happens after i backwash / rinse and repeat a few times.