The pipework carrying waste water from toilets, sinks, baths and appliances away from a building. It should never receive rainwater, because the treatment network is not sized for storm volumes.
What it means for you
If your foul drain misbehaves only when it rains, something is connected to it that should not be.
Not sure whether this applies to your property? Ask us. There is no call-out charge and the price is fixed before any work starts.
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