I have a problem with waste water flooding up through the sink erator and all over the kitchen counter, each time the dishwasher is used. I have taken to placing a rag about the erator and capping the whole thing with an upside down glass measuring cup to direct the water to flow only into the sink. Is this a simple fix or should I consult a plumber??
Plumbing – Water flooding out of “Sink Erator/Dishwasher Air Gap
drain-waste-ventplumbing
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Plumbing – Do waste water pipes for kitchens and bathrooms require a minimum slope to avoid clogging
I am not in the UK but my city uses the International Plumbing Code.
Everything needs to have the required slope. The required slope depends on the size of the pipe.
IPC table 704.1 shows that a pipe with an ID (interior diameter) of 2.5" or less needs 1/4" per foot. While a pipe that is 3" to 6" only needs 1/8" per foot.
Since the pressure drops for both hot and cold at this fixture, the problem is inside the fixture as you've already guessed. The first place to look is any aerator or filter screen on the fixture, debris gathering there will quickly slow the entire flow. Looking at the diagrams for your faucet, I believe that will be part P (the flow straightener) in this picture (Q appears to be a tool for opening the end of the spray assembly).
You can also verify the pressure from before the fixture is strong by disconnecting the hot and cold supply and running them into a bucket or drain to check the pressure coming from after the shutoff valves.
The problem could also be in the mixing valve and you'd need to remove and inspect the cartridge if it's there. basically anywhere after the two water lines merge could have a blockage.
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Best Answer
There is a clog somewhere. Sounds like your dishwasher drain line goes into your disposal which sometimes causes issues. It sounds like the water is coming out of the air gap on top of your sink. If the water is also coming up through the disposal the blockage is in your drain somewhere after the disposal in the P trap or waste line. If the water is only coming out of the aerator up on the back of the sink you probably have a block in the DW drain line between the aerator and the disposal. This could be a kink in the line or a debris blockage. If so, this is not a hard fix. Check for kinks first. Something may have been shoved up against the line under the sink and kinked it. If you don't see a kink you need to disconnect the line from the side of the disposal and clean any debris you might find out of the line.The debris could be anywhere between the aerator and the disposal. If it's up near the aerator it may be a difficult to reach but I'm pretty sure that will solve your problem.