I bought a Krystal Clear 3000 GPH Above Ground Swimming Pool Sand Filter Pump and installed it today. I used pool filter sand. The instructions said to run it on Backwash until the water is clear in the sight glass or flows clear out of the outlet. The water is clear but the sight glass still has some sand in it. I had my hand in the flow of the outlet and it has a very little amount of sand in it. I could barely see it on my hand. I let it run for at least 10 minutes. When I set it to Rinse the sight glass clears up and I see no sand on my hand. Does that mean that I am safe to turn it to Filter?