I was looking for a sewage treatment plant, and I came across this site.
It’s one of the best sewage treatment plants I have seen in years. It needs no electricity to power it, it can never break down, and will never need servicing or repairing. On top of that it’s shallow, requires no concrete, is very easy to install and never smells.
If you’re looking for an amazing sewage treatment plant, then I highly recommend you take a look at this. You can see it here.