Domakihub How to Unclog a Floor Drain in 5 Simple Steps
Clear standing water from your bathroom, terrace, or utility room drain without calling a plumber.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 4 min read
A slow or blocked floor drain is one of the most common maintenance headaches in Greek apartments, holiday rentals, and hotels — especially in bathrooms and terraces where flat grate-style siphon drains collect soap scum, hair, and debris over time. The video above walks through the process visually, while the steps below give you a clear, ordered method you can follow room by room. With a few basic tools and fifteen minutes, you can usually clear the blockage yourself and restore proper drainage before standing water becomes a bigger problem.
Why Floor Drains Block Up
Greek apartments — and most Mediterranean-style builds — use a flat, grate-covered siphon drain set flush into the floor tile. The siphon cup beneath the grate holds a small water seal that blocks sewer gases, but that same cup is a trap for hair, grit washed in from terraces, soap residue, and mineral scale from hard water. Over months, this buildup restricts flow until water pools across the floor.
Utility rooms and laundry areas face an additional hazard: lint from washing machines and detergent residue can form a dense plug at the siphon outlet or a short distance into the branch pipe. Terrace drains collect leaf matter, dust, and occasionally debris from wind. Identifying where the blockage sits — at the grate, the siphon cup, or deeper in the pipe — determines how much effort the job takes.
What You Will Need
Most floor drain clogs can be cleared with items already in the home: rubber gloves, an old toothbrush or stiff-bristled brush, a bucket, a jug of hot water, and a bottle of standard drain cleaner or a homemade baking soda and vinegar solution. For deeper blockages in the branch pipe, a handheld drain snake (also called a plumber's auger) gives you the reach you need — these are inexpensive and available at any hardware store in Greece.
Keep paper towels or old rags nearby to catch the water that spills when you lift the siphon cup. A mild disinfectant spray is useful for cleaning the grate and surrounding tile once you finish.
How to Unclog a Floor Drain: Step by Step
- 1
Remove the Grate and Rinse It
Lift or unscrew the flat grate cover — most Greek floor drains either pop up with a flat-head screwdriver or unscrew with a quarter-turn. Set it in the sink and scrub both sides with an old toothbrush and dish soap to remove soap scum and mineral deposits, then rinse thoroughly. A clean grate ensures you are not reinstalling the problem.
- 2
Scoop Out the Siphon Cup
Reach into the drain opening and twist out the siphon cup — the small removable bowl that holds the water seal. Empty its contents into a bin, then scrub the cup inside and out with a stiff brush and warm soapy water. This cup is where the majority of hair and grime accumulates, and cleaning it alone often restores full drainage.
- 3
Flush with Hot Water and Drain Cleaner
Pour a kettle of hot (not boiling) water slowly into the open drain to soften any residue further down the pipe. Follow with a dose of drain cleaning gel or a cup of baking soda chased by half a cup of white vinegar. Let it sit for ten minutes while the foam breaks down grease and soap buildup in the branch pipe below.
- 4
Snake the Branch Pipe if Water Still Pools
If standing water remains after flushing, feed a handheld drain snake into the pipe opening, rotating the handle clockwise as you push it forward. Work it in and out several times to break up or hook the blockage. Pull the snake back slowly and remove any debris clinging to the tip. Flush again with hot water to confirm the pipe is clear.
- 5
Reassemble, Test, and Deodorise
Replace the siphon cup so it sits level, then refit the grate. Run the tap or pour a full bucket of water into the drain and watch that it clears quickly with no pooling. Finally, pour a litre of clean water into the drain to restore the siphon water seal, which prevents sewer odours from rising into the room — particularly important in holiday rentals that stand empty between guests.
Rather have a pro handle it?
Get a vetted plumbing pro in your city — one number, booked in EN/EL/DE.
FAQ
- How often should I clean a floor drain in a Greek apartment?
- A quick monthly rinse of the grate and siphon cup is usually enough for a regularly used bathroom. Terrace drains should be checked seasonally — especially before and after winter, when wind-blown debris accumulates. Holiday rental properties benefit from a full clean between every guest stay to prevent odours and slow drainage complaints.
- Can I use chemical drain unblockers on Greek apartment drain pipes?
- Yes, but use them sparingly. Standard gel-formula drain cleaners are safe for the PVC pipework found in most modern Greek buildings. Avoid heavy caustic products (lye-based liquids) on older copper or galvanised pipes, and never mix different chemical products in the same drain — the reaction can produce dangerous gases. When in doubt, hot water and a mechanical snake are the safest first option.
- What if the drain still smells bad after cleaning?
- A persistent sulphur or sewer smell usually means the siphon cup's water seal has evaporated — common in floor drains that are rarely used, such as a terrace drain or a guest bathroom. Simply pour about a litre of water into the drain to refill the trap. If the smell returns within a few days, inspect the siphon cup for cracks or check that it is seated correctly, as a damaged cup cannot hold a water seal.