Thanks. I'm confused about the plumbing because I read in a few places that this filter has to be plumbed in like a "sand" filter not a DE filter. Mine is plumbed in as a DE filter as the bottom outlet is to waste. When I pull up the slide valve and turn on the pump, it empties to waste like a backwash. The thread I referenced seems to confirm it is to be installed like a sand filter. I searched all over and can't find a pic of an installed Quad DE although I found that people use a sand valve instead of the slide valve. Wish Pentair had better install instructions. Seems ridiculous that a company doesn't provide clear instructions for installing such a filter. Thanks.Bama Rambler said:It appears the my worries about the filter being backwards is unfounded. That's a good thing. It's the "Inlet" and "Outlet" labels that were screwing with me.
It appears that in the last pic of your plumbing is correct.
Specifically relating to the solar; when you have solar selected the flow would go out the bottom of the three way valve, through the solar panels and back through the check valve "2". There would be no flow from the side of the 3-way valve to "6" so there would be no opposing flows.
It's possible, but highly unlikely, that the solar return is allowing air to enter the system when it's running as the pump pressure would be forcing the check valve closed and if it was leaking it would leak water out at the roof.
There's still the matter of how the rubber pieces got into the Caretaker and whether they clogged up anything.[/quote]