Mini sewage reatment plnts

The septic tank that serves my property needs to be replaced. I would prefer to install one of the small subterranean sewage treatment plants sold by Klargester, Titan etc. The main reason I want to do this is that it would produce much lower pollution levels and locate in a more convenient place. I would like to hear from people with recent first hand experience of these.
Peter Crosland
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