Home › Blocked Drains
Serves: one drain running freely again. Most blockages clear with patience and the right method — a few are never yours to clear at all.
The short version: for a slow sink, try boiling water and washing-up liquid first, then a plunger. Never pour fat, oil or wet wipes down any drain — especially on a septic tank. If every drain in the house backs up together, or an outside gully keeps overflowing, that's often beyond a sink plunger and worth ringing 020 4577 2888 to be put through to a local plumber.
Boiling water and washing-up liquid first, then a plunger. Two gentle attempts, no harsh chemicals, before you call.
A drain snake or a flexible plastic "drain stick" from a hardware shop is worth trying before you call, especially on a bathroom sink or shower where hair is the usual culprit — it's a genuinely useful tool for a householder to own.
Fat, oil, wet wipes and nappies — none of it, ever, and especially not if you're on a septic tank. These are the ingredients that turn a slow drain into a blocked one.
Fat and cooking oil are the classic offenders: they go down warm and liquid, then set hard as they cool further along the pipe, narrowing it a little more with every wash-up until the day it finally chokes. Let fat cool in a jar or old tub and bin it instead — it costs nothing and saves a callout.
Wet wipes, cotton buds, nappies and sanitary products don't break down the way toilet paper does, no matter what the packaging claims, and they're one of the most common causes of a blocked toilet or a choked sewer connection. On the many septic tank systems around the Ballymoney countryside, the stakes are higher still — a septic tank relies on bacterial action to work, and wipes, excess chemicals and strong bleach can clog or disrupt a tank that would otherwise run for years without trouble.
An outside overflow usually means the blockage is further down the run, not at the fixture you'd expect. Don't lift a manhole cover you're not confident about — describe what you see instead.
Water pooling around an outside gully, or bubbling up from a manhole in the garden or yard, points to a blockage somewhere in the pipe run between the house and wherever that drain discharges — a much bigger job than a plunger reaches. Note where the water's rising, whether it smells, and whether it clears and returns with use of the house.
A manhole cover can be heavy and the chamber beneath isn't somewhere to explore without the right equipment, so this is one to describe on the phone rather than tackle yourself. Rodding rig or a drain camera does the job properly, and a plumber covering rural Route properties will know whether yours runs to the mains sewer or to a septic tank, which changes the approach.
A single fixture blocked: almost always yours. A persistent blockage hitting several properties: possibly NI Water's public sewer. Worth asking a neighbour before you call.
NI Water is the public sewer authority in Northern Ireland, responsible for the shared sewer network once your drainage joins it. If it's just your kitchen sink that's slow, the fault sits on your own pipework and is a plumber's job through and through. But a blockage that keeps recurring, affects more than one house on the street, or shows up as sewage surfacing outside rather than staying in a sink or toilet, can point to the public sewer rather than any one homeowner's drain.
If you suspect the second case — especially if a neighbour mentions the same trouble around the same time — it's worth contacting NI Water directly as well as ringing this line, since a public sewer blockage isn't something a household plumber can resolve on their own. Say what you've noticed and let the professionals work out which side of the boundary the problem sits on.
Sparingly, on a straightforward slow drain — but they're harsh on older pipework, unsafe to mix with each other, and next to useless on a solid blockage. If one bottle hasn't shifted it, don't reach for a second or a stronger brand; that's the point to try a plunger or call instead.
That points to the main drain run or the sewer connection rather than one sink's pipework, since a single fixture blockage wouldn't affect the whole house together. It's worth checking an outside manhole cover if you have one before calling, and mentioning that every fixture is affected when you ring, since it changes the tools the plumber brings.
It changes what you should never put down a drain, since septic tanks rely on bacterial action that chemical cleaners, wet wipes and excess grease can disrupt or clog outright. A tank that's overflowing or smelling strongly outdoors is often a tank problem rather than a household drain fault, and it's worth saying you're on a septic system when you ring, since it's a different job to a mains sewer connection.
Rarely, if used sensibly on a sink, bath or toilet with standing water to seal the plunger properly. It becomes counterproductive only if you're plunging hard against a blockage that's actually further down the system, where the pressure has nowhere useful to go — if a few firm attempts do nothing, stop and call rather than keep forcing it.
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