Cross Connection - Syphoning
Thanks for reading my question. I am wondering, if a washing machine is draining into a laundry tub, and the water in the laundry tub fills past the washing machine drain hose (so that the hose is submerged in the water), what is the likelyhood that the washing machine will syphone the dirty water back into the macihne?
Thank you
Solution Summary
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This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Question about dirty water siphoning back into a washing machine from a laundry tub
- The problem
- The query was whether dirty water in a laundry tub could siphon back into a washing machine if the tub water rises above and submerges the machine's drain hose.
- Likely cause
- The accepted reply says back-siphoning would normally only occur if the water level and hose arrangement allow a straight run down into the pump. If the drain hose rises before going down to the pump, siphoning would not normally occur.
- What fixed it
- No repair was documented. The accepted advice was that the risk depends on the drain-hose layout and relative water levels. A hose arrangement that goes up before descending to the pump was indicated as preventing siphoning.
- Checks to try
- Whether the laundry tub water level is higher than the water level in the washing machine
- Whether the drain hose has a straight run down into the pump
- Whether the drain hose goes up before it goes down to the pump
- How the laundry tub is arranged to drain or empty
1 Answer
Hello, It sounds an unusual way of running a washing machine. Without knowledge of exactly how it's set up I can't say, for example how much higher is the laundry tub and is there a hole in the laundry tub for the water to drain away or does it fill up - and if so how do you empty all the water away when it's finished?
In order to siphon into the washing machine the water would normally need to be higher than the level of the water in the tub or at least have a straight run down the drain hose. Sometimes water from a sink can siphon into a washing machine if there is a straight run from the sink connection down into the pump, but if the drain hose goes up before it goes down to the pump siphoning doesn't occur (as shown in item 2 on this page 5 things to check for after connecting a washing machine.
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