Problem afterbackwashing..

To answer your question on your air release...

When I backflush mine, once I get it back to "clean" mode, I let it come up to pressure then bleed off the air in the filter. I believe this to be correct, but I am ok with being corrected by those with more experience than I have (won't take much!) So it should be closed during getting everything back to pressure, open if you need to bleed off air, then closed again.
 

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