The TES scheme was introduced in 1995 with the aim of ensuring that trades which discharge effluent which is stronger than domestic sewage pay the Government for the extra cost of treating their higher strength wastewaters.

• 计划在一九九五年引入，旨在确保污染程度比一般住宅为高的工商业用户，向政府缴付处理污染浓度较高污水的成本。