My newly built pool was filled last week and I have been brushing twice daily for 6 days now and there seems to be no reduction in the amount of dust being kicked up. Is this normal? During my indoctrination, I was shown how to divert all of the suction to the 2 main drains in the deep end. This was 3 days ago. I find it interesting to brush at night with the light on so I can see how much plaster dust is getting kicked up while I brush. Unfortunately, when I was brushing the dust toward the main drains, I didn't see it getting sucked in like I expected. The next day, I took a swim with the suction diverted to the main drain and swam down and held my hand over it. I didn't feel a lot of suction. Am I expecting too much or is this not normal. Is there a way to test if the suction is too low?