In 2013 we were asked to investigate the private water supply at the above location, both treated water quality and pressure into the property were poor.
The system comprised of:
- Borehole with submersible pump
- Break tank and sparge bar
- Jet pump and 100 litre horizontal PV
- 1252 vessel with early 5600 control valve Iron removal filter
- Autotrol 255 water softener
Ground water is pumped up from the BH and into the break tank. This is controlled by a float switch. A sparge pipe (a pipe with multiple small holes along its length) across the surface of the water at the top of the tank sprays the water into the tank.
The water is then drawn from the break tank and pressurised by the Jet pump, pressure vessel and associated controls.
When a drop in pressure is detected in the property the Jet pump runs and the water passes through the iron removal filter and water softener.
There are a number of inherent problems with this type of installation which effect performance and reliability:
The iron removal process relies on aeration of the incoming water. This is achieved by using the sparge pipe to encourage and agitate the water into taking on oxygen from the atmosphere.
This it does and the oxygen starts to react with the iron. The majority of the iron changes from the Ferrous (dissolved, Fe 2+) state to the Ferric (precipitated, Fe 3+) state and starts to deposit in the tank.