What causes a toilet bowl to empty?
Your toilet may randomly empty itself for one of the following reasons. Your sewage system may not be properly vented, causing back-siphonage. The flapper in your toilet may be damaged and is not sealing properly, triggering random flushing. High water pressure can also cause your toilet to run at random times.
What happens when I Flush my upstairs toilet?
When I flush my upstairs toilet, the downstairs toilet floods and then slowly drains. What’s happening? Like my long title says, downstairs toilet is flooding after either of my upstairs one flush but then it slowly drains.
Why does the toilet flush down the vent stack?
So, when the upstairs toilet flushes a large volume of water down the vent stack it forces air up through the toilet since it cannot go up through the AAV. The only really good solution is to add a vent to the downstairs plumbing that goes all the way to the attic and joins the house vent stack there.
How to stop downstairs toilet from bubbling when upstairs?
Your problem is the distance the water/waste is falling. To eliminate the bubbling a vent would need to be added or an up flow valve after the basement toilet prior to entering the main line. Up flow valves are like a check valve to prevent lower floors from having this problem.
Where is the drain from the downstairs toilet?
Without knowing your house layout, you can follow the drain from the downstairs toilet to where it meets the pipe for the drain from the upstairs toilet. Once you identify the drains intersection, look for another drain from any sink anywhere in the home that is PAST the intersection of the two toilets pipes AND closer to the main sewer drain.
When I flush my upstairs toilet, the downstairs toilet floods and then slowly drains. What’s happening? Like my long title says, downstairs toilet is flooding after either of my upstairs one flush but then it slowly drains.
So, when the upstairs toilet flushes a large volume of water down the vent stack it forces air up through the toilet since it cannot go up through the AAV. The only really good solution is to add a vent to the downstairs plumbing that goes all the way to the attic and joins the house vent stack there.
Without knowing your house layout, you can follow the drain from the downstairs toilet to where it meets the pipe for the drain from the upstairs toilet. Once you identify the drains intersection, look for another drain from any sink anywhere in the home that is PAST the intersection of the two toilets pipes AND closer to the main sewer drain.
Your problem is the distance the water/waste is falling. To eliminate the bubbling a vent would need to be added or an up flow valve after the basement toilet prior to entering the main line. Up flow valves are like a check valve to prevent lower floors from having this problem.
