Development of robust sustainable drinking water treatment technologies requires improved methods of metering aqueous chemical solutions. Existing gravity powered technologies require contact with the chemical solution when adjusting the flow rate or they do not provide a calibrated method for setting the flow to the target value. We developed a low cost flow controller based on laminar pipe flow with a variable calibrated flow. The range of possible design flow rates is a function of the viscosity of the solution. For dilute solutions with viscosities similar to pure water the flow controller can be designed in the range of 10 to 400 ml min−1. The flow controller has been field tested for metering chlorine and aluminium sulphate for AguaClara water treatment plants in Honduras.

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