Wet System

Let's talk about sewage and regeneration!

Sadeh’s loos, laundry, taps etc, like many other countryside properties, currently drain into a septic tank system which is located under ground as most countryside properties are not connected to mains sewage. The septic tanks should be emptied approximately twice a year but soakaways often get blocked and ours has had to be emptied at least once a week for a few years. A big truck has to drive up our countryside road pushing diesel into the air out of its exhaust pipe once to twice a week. It sucks out all the 'dirty' water, which is now filled with a potentially useful product (nitrogen from all our wee which is very useful for growing lovely, nutrient rich, organic veg), and drives off disposing of it somewhere in a potentially harmful way. This whole processes eats produces lots of carbon and wastes a very useful product.

WET system benefits

Carbon sequestration

The system will be planted with 1000 willow trees, 60 fruit trees and 3,225 marginal wetland plants. The plants will sequester tons of carbon out of the atmosphere and at the same time they will be pumping out beautiful oxygen. 

Soil life

The soil within the WET system will increase in biodiversity, microbial life and healthy soil structure therefore increasing carbon storing capacity and regenerating our soil life. Our soil improvements will be monitored by scientific testing.

Swimming pond & water

All the water that flows onto our site will stay on our site. It will be purified through the plant roots and the soil becoming a beautiful, fresh swimming pond/Mikvah. The system is also great at flooding prevention by slowing down the water flow and storing water on the surface. 

Wildlife habitats

New wildlife habitats are created in the new pond area and the plant banks - wildlife biodiversity is increased!

Community science

People of all ages can get involved in practical science work with testing soil, surveying species etc.  Follow our science updates here!

What is waste?

Schools and community groups who already come to Sadeh will be able to learn about microbes, carbon, plant species, water recycling and waste


Alex Sylvester

Alex is a farm manager at Sadeh where he co-manages the land, creating gardens and wildlife habitats as well as running environmental educational programmes for visiting groups. Alex has a scientific background and a love of permaculture systems. He continually works to enhance Sadeh’s biodiversity and can see huge potential benefits to the land from the WET system!

Dr Lena Ciric

Dr Lena Ciric is an Associate Professor in Environmental Engineering at the UCL Department of Civil, Environmental and Geomatic Engineering. She is an environmental microbiologist whose research expertise lies in the application of molecular biology techniques to the profiling of microbial communities in various environments ranging from drinking water filtration systems, diesel contaminated groundwater and high touch surfaces in the spaces we spend our time in.

UCL Page 

The research group

Twitter: @drlenaciric


Professor Benny Chain

I obtained a PhD in comparative electrophysiology at the University of Cambridge, and then studied comparative invertebrate immunology at the Sloan Kettering Institute in New York. I joined Prof. Av Mitchison at UCL in 1982, becoming Professor of Immunology in 1996, and holding a joint appointment in Computer Science as Professor of Computational Immunology since 2018. I hold a visiting professorship at the Weizmann Institute, Israel, working with the systems immunology group led by Prof. Nir. Friedman. As a trustee of Sadeh, I oversee any current scientific projects.