How often should I clean an outside drain gully?

In a typical Greek household, a thorough clean every three to four months is enough. If your gully collects kitchen waste or sits beneath deciduous trees, clean it monthly during autumn and after heavy rains. Holiday rental properties benefit from a check between every guest turnover.

What if the gully keeps blocking even after cleaning?

A persistently blocking gully usually means the underground pipe beyond the trap has a partial obstruction — often a build-up of grease solidified further along the run. Hire a drain engineer to carry out a high-pressure water-jetting or CCTV survey. In older Greek properties, clay pipes can also have root intrusion that no amount of hand-clearing will fix.

Is it safe to use chemical drain unblockers in a gully?

Caustic or acid-based products work in a pinch but carry risks: they can crack older ceramic traps, damage the rubber seals in plastic chambers, and harm the beneficial bacteria in a septic system if you are outside the municipal sewer network — common in rural and island locations in Greece. White vinegar and hot water are a safer first choice; reserve chemicals for stubborn grease blockages, and never mix different products.

How to Unblock an Outside Drain Gully Yourself

Name: DIY Fix For a Blocked Drain or Gully Outside
Description: Clear a blocked outdoor gully in under an hour with basic tools — no plumber needed.

Clear a blocked outdoor gully in under an hour with basic tools — no plumber needed.

Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read

An outside drain gully is the shallow, floor-level trap you find beside kitchens, patios, and courtyards — it collects rainwater and household grey water before sending it into the main drainage system. When it blocks, water backs up fast, and in a Greek summer that standing water quickly becomes a breeding ground for mosquitoes and unpleasant odours. The video above shows the full process in action; the steps below walk you through it in detail so you can tackle it confidently whether you are maintaining a family home, a holiday villa, or a hotel courtyard.

What Is an Outside Drain Gully?

A gully is a small rectangular or circular chamber, usually made from glazed ceramic or plastic, set into the ground with a removable metal or plastic grid on top. Inside sits a water-filled trap — a U-shaped bend — that blocks sewer gases from rising. Kitchen wastewater, washing-machine outflows, and rainwater all funnel through it before travelling down the underground drain.

Over time the trap collects leaves, grease, silt, and soap residue. In Greece, olive-oil-heavy cooking and seasonal leaf fall from almond or lemon trees make gully blockages especially common. A blocked trap does not sort itself out — it needs to be physically cleared.

What You Will Need

You do not need specialist plumbing equipment. Gather a pair of rubber gloves (long ones, ideally), a wire coat hanger or a drain auger, a stiff-bristled brush, a bucket of hot water, a bottle of white vinegar or a proprietary drain cleaner, and a garden hose. A small trowel or old spoon is useful for scooping out compacted debris. Have a bag for waste and a second bucket ready to catch displaced water.