It's fast approaching the point where I have to decide which treatment plant i am going to install.  I've narrowed it down to either of these two, having discounted the unit normally installed locally (Klargester Biotec).   The two contenders which I can easily source or have delivered up here are:   Biopure - http://www.bio-pure.com/?gclid=CO2dvf2Qoc4CFUmeGwodXOoKxA  also available on Ebay at a lower price   Conder ASP6 - https://www.septictank-supplies.co.uk/index