Black tank flush questions

I dump the bt, then close the drain and let it fill for 30-45 seconds from the flush connection then open the drain. This gets a surge of water and "stuff" out through the drain. I do this 3 times. I have a clear connector on my drain and by the time that 3rd flush comes out the water is surprisingly clear. Then I shut off the bt flush, close the bt drain and empty the grey water. It is crucial that you stay with the bt flush, and not get distracted. I could see getting distracted while all that water is going into the bt and suddenly having a huge mess. Think about where that water would go if the drain was closed and more water was going into the tank! Last, dont forget to blow air through that bt flush when you winterize so you dont havd a frozen/split line. Happy new year in your new trailer!