DE sand on the returns after opening filter

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S

sdtfp

Gold Supporter
Jun 4, 2020
158
NYC
Pool Size
17500
Surface
Plaster
Chlorine
Liquid Chlorine
I wanted to deep clean the DE filter and so I put the mpv to closed and opened the filter drain. I think I also open the pressure guage on top of the filter for a few seconds. This caused a lot of DE to go into the pool from the returns. Is this normal? Should I have the mpv on another setting? I have waste, backwash, close, winterize, filter, rinse.

Is it safe to keep the pump running and manually vacuum to pick up all the DE back up?

I am also worried I haven't been doing any maintenance on my MPV. Maybe that is the issue. It is a pentair and the label part number is 273207 rev h. Maybe I need to open that up and replace orings and lube? Anyone know if there is a kit for maintenance on this? I don't want to open it up without being ready to replace any broken orings.
 
Last edited:
SD,

Yes... if you break the vacuum everything will just dump back into the pool unless you have valves to keep that from happening. In my case, I shut off both my Intake and Return valves, any time I open the filter.

Thanks,

Jim R.
 
Jimrahbe said:
SD,

Yes... if you break the vacuum everything will just dump back into the pool unless you have valves to keep that from happening. In my case, I shut off both my Intake and Return valves, any time I open the filter.

Thanks,

Jim R.
Click to expand...
Thanks for the confirmation! I was really confused because I think I've done this before and it hasn't happened. Maybe I had DE come out before and I didn't notice...

I dont have a shutoff for neither intake or returns. I can disconnect the pump pvc for intake. For return I can set mpv to waste and itll pass to my separation tank and then to the ground. Is that the best I can do?
 
I always backwash my DE filter before doing a breakdown cleaning. That washes most of the DE away before you even open the filter. Less mess to deal with, since only a bit of the residual DE is left to clean up.
 
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chiefwej said:
I always backwash my DE filter before doing a breakdown cleaning. That washes most of the DE away before you even open the filter. Less mess to deal with, since only a bit of the residual DE is left to clean up.
Click to expand...
So I set the mpv to waste and I still got a ton of DE in the pool. Maybe last year I did as you mentioned and backwashed before I did a breakdown cleaning. I am going to try that now. But I am pretty upset about this process. I guess I need to install a valve somewhere on the return so that I can solve my issue.
 
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