Why do P-traps lose water when the ejector runs?
When a new ejector pump runs, it can siphon water out of kitchen sink and master bathtub P-traps. This causes the traps to lose their water seal and allows a sewage smell to enter the home.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1having plumbers scope the line for a belly
- 2dealing with tripped GFI circuits on the ejector pump
- 3Replacing the faulty faucets
- 4Using channel locks to try and shut off the faucet
- 5Considering water treatment systems like softeners, carbon filters, or electronic descaling systems
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Since the remodel, we’ve noticed the new master bathtub and kitchen sink P-traps can lose their water when the ejector runs, causing a sewage smell, especially in the master bathroom.”source ↗
“What could cause one or multiple P-traps to siphon when a new ejector runs, and how would you properly diagnose and fix it?”source ↗
“Since then, one of the three faucets attached to the house began to not shut off completely.”source ↗
“Several months later, it was doing the same thing. Could not shut it off even with channel locks.”source ↗
“However, the second faucet (pictured) just started the same thing. Plumbing folks came out and replaced it, BUT cautioned me that there must be something in our water causing this issue”source ↗
Where this came up
People with this problem also raised
- 5Water leak from screw after flushing water heater
- 14Why does my toilet still leak after replacing the seal?
- 4Why do kitchen sink slip joints keep coming loose?
- 12Why is there no water pressure after changing a faucet?
- 6Why is my steam shower outlet constantly leaking water?
- 8Why is only one tap losing hot water?