- May 30, 2009
- 23
When back washing or rinsing, I see sand in the sight glass of my brand new hayward unit ( for an above ground pool.) I have to wonder why, and am I pumping sand out of the filter with every backwash? I followed the instructions for filling the filter tank. I thought a small amount at first would be ok,,and I have removed the sight glass and emptied the sand ,but it returns . Is this normal?