An ideal introductory product for 'light' rainwater harvesting irrigation requirements, typical use could be to supply rainwater to a garden tap, greenhouse sprinkle or irrigation system.

The Garden System

A 1500 litre capacity rainwater harvesting and irrigation system, comprising of: Leaf filter, calmed inlet, skimmed overflow, silt trap, storage tank, pump and timed delay activation switch. In its installed state the product allows the user full access to all components pump, filter, skimmed overflow, major piping junctions, and silt trap for service and system maintenance.

1500 litres of rainwater storage comes from eight Polystorm lite cells which are supplied wrapped and welded into a geomembrane for water tight storage and a geotextile fleece for light protection during installation. The chamber supplied is ready for installation with the silt trap, leaf filter, calmed inlet, overflow socket connection, rainwater inlet socket, pumped water pressure outlet connection fitting and outlet to tank socket connection fitted.

Also supplied ready for installation is eight Polystorm cells pre-wrapped in a geomembrane and geotextile to be connected to the chamber with inlet and ventilation socket fitted.

Surface water enters the chamber via the rainwater inlet. It is then filtrated through a leaf filter; waste travels through a waste outlet while filtrated water travels vertically down and back up through
a calmed inlet.

The filtrated rainwater remains in the chamber until a predetermined level, where thereafter it flows into the connected Polystorm storage tank. This process minimizes the amount of silt build up in the tank as all rainwater initially enters the chamber; any silt therefore remains in the accessible chamber where it can be removed during maintenance and doesn't enter the Polystorm tank. The timed delay switch has a sufficient IP66 rating so it can safely be mounted indoor or outdoor to suit the users' convenience. When pressed the system activates and the pump begins to prime and build sufficient pressure between the outlet and pump: recommended delay setting is 20 minutes. The pump has a built in pressure drop sensor so only 'pumps' when the tap (or other suitable outlet) is opened.

The pump gathers stored rainwater through a secondary filter subsequently prolonging the pumps life and pumps to the
plumbed outlet.

The pump and calmed inlet sit on a ledge creating a silt collection sump. The calmed inlet ensures that any silt in the tank is not disturbed; the offset level ensures any silt that is not removed by the initial filtration will relocate harmlessly to the bottom of the chamber where it can be removed during periodic maintenance of the system.

As all major components are located within a 600mm diameter chamber the space required for installation is minimal. The design of the chamber is such that all the components are accessible via the chamber. This makes periodic servicing of filters and desiltation easier as it all takes place within the chamber.