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I did cover the sandpipe (and the amount of sand was more than what would fit in the pipe). I did not rinse as I thought that should be done after the backwash for 4 mins and I was afraid if I ran 4 mins I would have no sand left.

I have a Pentair SD35 sand filter which I replaced the sand in. I used 100lbs of #20 silica sand as recommended. I also removed the standpipe and laterals and inspected, everything was fine. After putting back together and running a backwash cycle a heavy amount of sand was coming out of the...