I don't know if the pressure spiked or not. I checked it before I started vacuuming and it was at my 'start' point.

It's strange. The filter has never pumped the stuff back in to the pool as I am vacuuming like the cartridge filters did. It 'grabs' all the 'stuff' I'm trying to get out of the pool.


This instance was like someone just opened up a floodgate and for about 20 seconds, the filter pumped brown, murky 'poo' in to the pool.

I let the pump run all night, and backwashed a few minutes ago. Plenty of the 'poo' came out in the backwash.


So filter appears to be working fine. Except for yesterdays 20 seconds of doom.....


???

I will see if I can find some of the DE and try adding a bit at a time.

==================

With these sand filters, if they get too 'full' of crud from filtering, do they have a tendency to release a mass amount of it back in to the pool at one time?


It was as if the backwash handle was moved, but it backwashed back in to the pool.

Thank you both for the input so far! I appreciate it.

Kraig