Unblocking Drains: A Practical Guide

Blocked drains rarely happen without warning. Catching the early signs — and knowing what actually helps — can save you a much bigger job later.

Early Warning Signs

A slow-draining sink or bath, gurgling sounds from a plughole, or a faint bad smell around a drain are all early signs of a partial blockage building up. Dealt with early, these are usually a quick fix. Ignored, they tend to turn into a full blockage at the worst possible moment.

Safe First Steps to Try

For a kitchen sink running slow, a kettle of hot (not boiling, if you have plastic pipework) water with a squeeze of washing-up liquid poured slowly down the drain can help break up light grease build-up. For a blocked sink, bath or toilet, a good quality plunger — used with a firm, steady seal — clears a surprising number of blockages without any further tools needed.

What Not to Do

• Avoid pouring fat, oil or grease down the drain — it's the single biggest cause of kitchen blockages, as it cools and hardens inside the pipe.
• Don't flush wet wipes, cotton pads or sanitary products, even ones labelled "flushable" — they don't break down like toilet paper and are a leading cause of toilet and sewer blockages.
• Be cautious with chemical drain cleaners. They can be harsh on older pipework, aren't guaranteed to clear the blockage fully, and mixing different products is genuinely hazardous.

When to Call a Professional

Some signs point to something more than a simple local blockage:

• The same drain blocks again and again, despite clearing it.
• Multiple drains in the house are blocked or slow at the same time — often a sign the problem is further down the system, not at any one fixture.
• An outside drain or gully is overflowing, which can point to a blockage in the main run.

In these cases, a proper look with the right equipment finds the actual cause rather than just clearing the symptom — which is exactly what stops it coming straight back.

A blocked drain is rarely an emergency, but it doesn't get better on its own either. If the quick fixes above haven't worked, AVEC Plumbing Services covers drain unblocking across Crawley and the surrounding area.