Paul,
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So what exactly was wrong with the installation?
Septic tanks here, if they are newly installed, have to have a 5 chamber system with a re-circulating agitator in the middle.
The older system used a 1200 litre 2 chamber system, the newer one is 2400 litre and with a re-circ agitator and an outflow pump.
Mind you, you guys don't like litres, so I've posted it in that.
Get with it!!. [Linked Image]