Changing out air relief valve on DE filter

mattco

Gold Supporter
Jun 24, 2018
3
Herndon VA
I'm wondering what mistake I made changing out the air relief valve on my DE filter. The air relief valve began to leak recently, so I replaced it. It was successful, and water no longer leaks from the top of the filter, which is great, but I think I missed a step. I turned the pump off, and removed the air relief valve completely. Immediately I could hear water draining from the filter and I saw through the clear plastic on the top of my pump that the pump strainer basket was filling with cloudy DE laced water, and (I think) that water flowed back into my pool through the return jets. Oops!! Was I supposed to set the filter to backwash or winterize beforehand? I don't imagine I'll have do this procedure often, but I'm curious.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
10,783
Northern NJ
Welcome to TFP.

I am not sure what settings you have on your MPV. But it sounds like you rinsed the filter back into the pool when you opened the air valve with the pump off.

I am not sure a different MPV setting would prevent the filter from draining down. You might want to backwash the DE out first. Then open the air valve. Then load new DE in.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,260
Tucson, AZ
How did you manage to remove the valve? Mine is leaking a bit around the seal. I tried to spin it off, but I dared not twist harder for fear of breaking something.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,260
Tucson, AZ
I just kept turning it and it came off.
I had not been able to get it to budge, but have now seen a video of removing the gauge and maybe using a strap wrench. Next time I take the filter apart for a cleaning .... which should have been a few months ago :D