Sewer Tank Flusher

I can tell you how I do it and what I was told to do by a blank tank repair service. Why the service? 'cause I wasn't do it correctly the in the first place and developed the dreaded pyramid. The pyramid was concrete and had to be broken up with a high pressure wand. Anyway, I leave the tank valve closed and my other half stands inside and opens the toilet to start the flushing water. I turn on the flusher outside AND I STAND RIGHT THERE while the black tank fills. She watches on the inside and when she sees the water at the base of the pipe she knocks on the wall. When I hear the knock I immediately open the black tank valve and I get huge rush of water out and drain the tank which gets the tank pretty clean. We repeat this process one more time and then I let the tank flusher run for 3 minutes with the valve open. Done.