Yes. I expect your backwash water would be about 59 degrees, and I would go 9 gpm, or maybe 10.
If your tank is natural tan (unpainted), you can shine a bright light thru in the dark, and see the shadow of the media. It should rise during backwash.
If your tank is natural tan (unpainted), you can shine a bright light thru in the dark, and see the shadow of the media. It should rise during backwash.
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