Pool return

Why would one of my pool returns in the spa suck instead of blow water out?

This makes the spa slowly drain into the pool when the valves are set to suply and return to the spa. All other returns work properly.

Hello Dave - One of the most common causes for a jet to start sucking water instead of pushing water is a plugged orifice. The air line on that plugged jet is usually connected to the air lines of the other jets. Because the other jets are still drawing air, this can cause water to be drawn backwards through the clogged jet.

While the pump is running, you can try and free the obstruction using a screwdriver. If that doesn’t work you can remove the jet and look for any obstructions.

Also, look for any check valves on that line. A failed check valve can cause a return jet to suck water.