Only about 20 per cent of residents in one housing block taking part in Hong Kong’s waste charge trial were using the government’s pay-as-you-throw bags to dispose of waste, the estate’s property manager has said. Hong Kong is set to implement a waste charging scheme on August 1 after multiple delays. But the scheme has sparked controversy over its feasibility and enforcement, as opinion polls suggest a majority oppose introducing it as scheduled. Stephen Poon, the chairperson of the Hong Kong Association of Property Services Agents, said on Thursday that authorities should consider further po…