Down well injection systems are used to provide on-going control of the conditions within a well. Usually used to deliver hydrogen peroxide, down well injection systems are good at controlling biofouling by nuisance bacteria and are also effective against sulphur and methane.
A down well injection system for hydrogen peroxide starts with a chemical pump which is controlled by a PLC (programmable logic controller) running a special program designed by MacLellan Water Technology. The pump is used to deliver a predetermined amount of hydrogen peroxide from a carboy down a narrow plastic tube to the bottom of the well. There the hydrogen peroxide reacts to chemically destroy bacteria as well as sulphur and methane problems. With its control unit, the down well injection system can be made to deliver differing amounts of hydrogen peroxide as required by changing well conditions and water demands. It can also be adapted to properly dose the well when a high quantity of water is used, such as by a heat pump or sprinkler system.
A carboy of hydrogen peroxide normally lasts between twelve and eighteen months, and varies depending on water quality and use of the system.