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"Muddymike" wrote in message
om...
See http://www.erete.com.my/img/septic-tank-draw2.gif for an image of a 3
stage septic tank of similar design to the one found.

Never seen one or heard of one with a granule filter in it. I wonder how
often the granules have to be changed :-(( Mucky job.


We had one of these contraptions at the last house.
http://www.a-tanks.co.uk/tank%20pics%20060.jpgable

One of those wouldn't suit the OP with the water table so high! They have to
be concreteed down or they 'float' out of the ground when they have been
emptied!!

Mike