Background
From septic tank to decentralised sanitation.
When a septic tank counts as safe, what happens to the water after treatment, and why the purchase price is only the beginning.
Resources
Understand before you commit.
We do not write here to get clicks, but for the stage before you get in touch. Explanatory articles on biological treatment and answers to the most frequent questions, all in one place.
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Guide
The biological alternative to the septic tank.
Septic tank or biological plant: the first only lets solids settle and ends up clogged, the second treats the water with bacteria and without chemicals. We compare performance, odour, groundwater, maintenance and lifetime costs, and answer the most frequent questions.
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Guide
How does biological treatment work?
Microorganisms, biofilm, aeration and the sludge cycle in plain language. An explanatory article with no sales pressure, with a diagram.
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Guide
Why biological plants do not smell.
Oxygen supply, sludge balance, aerobic biology. Explains how a biological plant avoids foul-smelling gases, unlike a septic tank.
Continue
Frequently asked questions.
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Frequently asked questions
Answers to the questions that come up again and again in consultations, sorted by topic: treatment, service, costs, permits and installation.