Urine passes through a one-way valve that closes once flow has
stopped, preventing odours from being emitted into the washroom. The
configuration of the waste pipes usually needs to be changed as they
tend to work best with no traps or u-bends. Urine alone, rather than
water or dosing chemical, has to carry away the hair and other debris to
the main drain. The valve is the only barrier between the foul smelling
drains and the washroom, therefore its effectiveness is crucial to
success. There are many valve-based products available, some more
reliable than others. To avoid odour problems, the valve has to close
after use, having allowed any debris to flow through without becoming
stuck. As an additional measure, some products use a microbiological
block to treat the urine to help prevent build up in the waste pipes.
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