What blocks ac condensate drain unblocks in Central

Algae build-up in flexible drain pipe (humid HK climate)

Dust + lint from AC filter blowing into drain

Pipe slope incorrect causing water pooling

Outdoor pipe end blocked by debris

Central building patterns we see

Lan Kwai Fong / Soho restaurant grease (commercial volume)

Grade A office building common drains (lint + paper towel)

Hollywood Terrace residential — modern PVC simple blocks

Pottinger Street old buildings — clay pipe legacy

Method Compressed-air blow-through → vinegar flush → check pipe slope → test 10-min AC run for re-pooling.

Central-specific knowledge. Central is HK's commercial heart — mostly modern Grade A offices and a few residential towers (Hollywood Terrace, Centrium). Office building drains see daily commercial volume; restaurant clusters at Soho / Lan Kwai Fong drive most calls. Owners' Corp paperwork strict.
Service-specific method. AC dripping water inside / from outdoor unit = clogged condensate drain in 95% of cases. Blockage is dust + algae build-up at the narrow flexible drain pipe. 10-15 min job. Most-undercharged HK service.
Fixed price quoted on phone. No 'we'll see when we get there' surprises. From HKD 250.
7-day re-block guarantee. Same drain re-blocks within 7 days, we return free.
Receipt + tax invoice always. For tenant-landlord reimbursement or building AP.