The Medway Handyman wrote:
Rod wrote:

In a normal U-type waste the entire content is flushed almost whenever
you use it (as it retains so little water). In the version you
describe there could be a lot of water which might well not flush
through for long periods. That is a recipe for blockage and truly
revolting stagnant waste.

Yerbut, nobut, yerbut if you pulled out the plug on a sink full of water, it
would have the effect of compressing the air in the waste upstream of the U,
so less water would be pushed out of the other end?


Wasn't thinking about compression of air - but that is another thing to
think about!

In a normal trap even turning on the tap for s few seconds will cause
enough flow to replace all the water in the trap. So the foetid nasty
yuck gets taken towards the sewer. In the version you describe, a few
ounces of water entering the start of the super-trap will merely
displace the same amount from the far end. The majority of the water in
the trap will remain. The (relatively) fresh stuff will simply mix with
the yuck that is already there. Such yuck is very attractive to bacteria
which can form mats of blocking material.

--
Rod

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