According to Mr KOO (left), upon arriving at the scene, the DSD’s frontline workers will use devices to test for any poisonous or explosive gas in manholes, and they will only open them if the results are normal. After that, they will desilt the blocked drains with rattan strips or high-pressure water jets.

According to Mr KOO (left), upon arriving at the scene, the DSD’s frontline workers will use devices to test for any poisonous or explosive gas in manholes, and they will only open them if the results are normal. After that, they will desilt the blocked drains with rattan strips or high-pressure water jets.

According to Mr KOO (left), upon arriving at the scene, the DSD’s frontline workers will use devices to test for any poisonous or explosive gas in manholes, and they will only open them if the results are normal. After that, they will desilt the blocked drains with rattan strips or high-pressure water jets.