The special token is purchased by the community and inserted into the bulk meter on the reservoir. The Aqualan MB discharges 160 cubic metres of water into the reservoir, pausing if the tank becomes full, and continuing when some water has been used by the community. Up to 10 tokens can be inserted, for a credit of 1600 cubic metres. Prepayment standpipes for water vending to individual families. Families buy water credits at the vending office or point of sale, and then draw water from the Aqualan E standpipe, in any desired quantity.
Audible alarms indicate to users before the credit is completely depleted.
This system is in principle similar to the Aqualan E , but the entire credit which has been purchased is transferred into the meter on the piped connection. The vending of water credits in a consumer-friendly way is a key to successful project implementation. The base station is a standard computer management system, capable of managing many tens of thousands of consumers. So scarce skills are centralised in an appropriate way. The base station manages the whole system, prints reports and provides details of consumption and revenue.