On Saturday, I cleaned out my Pentair filter and replaced some of the old screens. When I unscrew the inline Jandy SWG, DTE flows back into the pool from the filter. I assume its DTE because it makes the water cloudy. If I run the pool pump for about an hour, the water becomes clear again. When I turn my pump off, it does not flow back into the pool. I have had the SWG for about 5 years and never noticed this until recently. Is this normal? Is there something that needs looking at? If so, what might it be?