The common wash trap used for the wash basin and kitchen sink in HDB flats is the bottle trap. Chokes are caused by solid matter or hardened grease in the bottle trap. To clear the choke, you will need a wire hook or thin stick.
Here is how you can clear the choke:
<ul>
 <li>Detach the lower section of the trap by twisting it open in an anti-clockwise direction</li>
</ul>
<img alt="trap1" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/trap1.jpg" />
<ul>
 <li>Remove the solid matter with a wire hook or thin stick. Flush with water to clear the remaining waste</li>
</ul>
<img alt="trap2" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/trap2.jpg" />
<ul>
 <li>Remove the cleaning eye cap if the obstruction is in the pipe</li>
</ul>
<img alt="trap3" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/trap3.jpg" />
<ul>
 <li>Use a wire hook or thin stick to remove the solid matter in the pipe</li>
</ul>
<img alt="trap4" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/trap4.jpg" />
<ul>
 <li>Screw the lower section of the trap back in position in a clockwise direction</li>
</ul>
<img alt="trap5" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/trap5.jpg" />

Clear choked wash basin or kitchen sink

<img alt="pillar tap" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/pillar-tap.jpg" />
A tap usually leaks when the washer is worn out.
Here is how you can replace the washer:
<ul>
 <li>Firstly, turn off the ball valve below the wash basin or stop cock located next to the water sub-meter in a clockwise direction to cut the water supply</li>
 <li>Use a screwdriver to remove the plastic cap at the top of the tap and the screw</li>
</ul>
<img alt="tap1" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/tap1.jpg" />
<ul>
 <li>Remove the handle</li>
</ul>
<img alt="tap2" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/tap2.jpg" />
<ul>
 <li>Loosen the spindle by using a spanner in an anti-clockwise direction</li>
</ul>
<img alt="tap3" src="/-/media/managing-my-home/renovation-and-maintenance/home-maintenance/home-care-guide/sinks-and-wash-basins/tap3.jpg" />
<ul>
 <li>Remove the spindle</li>
 <li>Unscrew the nut at the bottom of the spindle. Remove the rubber washer that is worn out and replace it</li>
 <li>Finally, re-assemble all the parts</li>
</ul>

Repair a leaking pillar tap

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Fixing Clogged Sinks or Leaking Water Taps in HDB Flats