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Frequently Asked Questions
What does a liquid seal cartridge do?
Holds a layer lighter than urine.
Liquid passes down through it.
And the layer floats back on top.
So gases cannot come past.
It is a seal without water.
How does a membrane trap differ?
It uses a flexible silicone sleeve.
That opens under flow.
And closes behind it.
There is no liquid to lose.
Or to top up.
Which should I choose?
It is a maintenance decision.
A liquid seal needs topping up.
A membrane can be held open by debris.
And perishes with age.
Neither is maintenance-free.
Why do waterless urinals start to smell?
Usually the cleaning chemistry.
Bleach-based cleaners degrade the seal liquid.
Which then stops sealing.
It is the commonest cause by far.
And it is a regime problem, not a product one.
Does the cartridge do anything else useful?
It collects deposits.
Which would otherwise reach the waste.
So replacing it on schedule.
Helps keep the drainage clear.
Not only the odour out.
Are cartridges interchangeable?
No - they match a specific outlet.
A near-fit that does not seat properly.
Leaks odour while looking correct.
Identify the urinal before ordering.
Make and model, not just the shape.
Do flushing urinals use these too?
They use conventional water-seal traps.
Which behave like any other trap.
Evaporating if the urinal is unused.
And siphoning if the drainage pulls.
Cartridge types suit waterless fixtures.