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EXCESS LIQUID ABSORPTION TRENCH.
This is the normal method for disposal of excess liquid, but refer to council
permit for any specific requirements. These instructions apply to installation of
the drain kit items available from Clivus Multrum. In some locations it may be
desirable or necessary to connect the excess liquid drain to a greywater system
or an alternative disposal method complying with AS / NZS 1547:2012.
Dig a trench in a position located in front of the liquid end product drain.
The trench is to be located in soil of good permeability and in a position
where ground water will not flood the unit. If there is some doubt as to the
permeability of the soil extra trenching length may be required especially if
a handbasin or other fittings will also drain to the same trench. The liquid
leaving the compost unit when in use is not expected to exceed 1 litre per day
per resident. In many domestic installations there is no excess liquid at all. In
public-use facilities, the liquid disposal system should be sized to allow for up
to 25 litres per 100 toilet uses.
Trench dimensions and construction are to be in accordance with AS / NZS
1547:2012, as shown below.
Dimensions in mm.
DURABLE SELF-SUPPORTING ARCH TRENCH.
It is important to ensure that the trench is level along its length. Ensure
the liquid drain pipe slopes away from the compost tank. Trench should be
protected from surface water and flooding, and vehicle traffic.
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