11 Jun 2026
If you have cleared a choked floor trap once, you know the signs: water pooling around the grating after a shower, a gurgling sound from the kitchen outlet, and a smell that arrives before the puddle does. When it keeps happening, the blockage is usually building up faster than it can drain away. Here is what is going on and what actually helps.
What a floor trap does
Every bathroom, kitchen and service yard in a Singapore flat drains through a floor trap. The U-shaped bend underneath holds a small amount of water that seals sewer gases out of your home. That same bend is also the first place hair, grease and debris collect.
The usual causes of repeat chokes
- Hair and soap scum binding together in bathroom traps
- Cooking oil and grease poured down the kitchen outlet, which cools and hardens inside the pipe
- Food scraps and rice washed off plates during dishwashing
- Mop water sediment and dust settling in the service yard trap
- An ageing or scaled pipe further down the line that narrows the flow
A single clearing removes the blockage you can reach. If the pipe further in is coated with grease or scale, a partial choke re-forms within weeks.
What you can do at home
Lift the grating and clear visible hair after showers. Wipe oily pans with a paper towel before washing, and never pour cooking oil down the sink. Flush the kitchen trap weekly with hot (not boiling) water and a squirt of dishwashing liquid to keep grease moving.
When to call a plumber
If the same trap chokes more than once in a few months, or more than one outlet drains slowly at the same time, the blockage is deeper than a household plunger can reach. A plumber can clear the full pipe run, check for scaling or a sagging section, and stop the cycle instead of treating the symptom.
A floor trap that drains fast and stays odour-free is a five-minute habit plus the occasional professional clearing. Catch it early and it stays a small job.