There exists enough solutions to clean the water – with chemistry or expensive filter systems produced by companies. But that’s not my way – I search for a sustainable solution which creates a real independent situation for me. A solution with which I can clean my water with sustainable, renewable raw material I don’t have to buy from a company. That’s the red line in all experiments.

The test environment for the water recycling system was built in the WERKREIHE, but is still not fully finished. Because the experimental phase with different materials for purifying the water brings that small adjustments have to be made. Because more filter materials are needed or the tank needs to be enlarged. I develop the filters to optimize them.

Structures are created to test a circulatory system with different cleaning stages and different materials in succession and to show which materials work like.

There are three cleaning stages – mechanical cleaning, biological cleaning and post-cleaning. During mechanical cleaning the large pieces of dirt are fitered out. This stage is the first purification phase in which the grey water runs.

In the second stage the water is biologically purified. The biggest challenge here is the reduction of the tensid in the water. Tensids are substances that reduce the surface tension of a liquid or the boundary tension between two phases and allow or support the formation of dispersions or act as a solution mediator. The active substances are contained in detergents, soap and shampoos and are used in every household. That is why I pay special attention to the second stage and will test a lot. After the biological purification the water passes through a further filtration to avoid possible residues from the biological purification.

In the menu HOW IT WORKS I’ll go into more detail and explain the cycles.

I carry out subsequent experiments and describe the structure of the experiment, the effect of the filters and the results. The series is open and begins with the experiments listed.


[ Experimentenreihe 1 | Cleaning with plants ]

Plants are used to reduce tensids and organic substances. This tests which plants are suitable and how long the plants need to reduce the substances.

[ Start | 06 | 01 | 2018 ]


A system for the recycling of water with natural and sustainable materials is a plant cleaning system (dt. Sumpfbeetkläranlagen). It’s a very old and well-known process in which plants are used to purify grey water in different stages.

Swamp bed cleaning levels are overgrown soil filters and thus complex systems whose mechanisms of effect are traced back to the physical, chemical and biological processes involved in the interaction of plants, soil and greywater. In a separate wiki post, which is linked here, I go deeper into the effect of swamp beds in order to explain the mechanisms behind it.

In line with the recycling of water in swamp beds, I would like to find out how a plant cleaning system can be integrated into the environment of a tiny house and how practicable this kind of cleaning is in daily use.

The following questions form the guide:

[1] What conditions are created by the environment of a tiny house?

[2] Which prerequisites must be created for the plant cleaning system so that it can purify water?

[3] What kind of cleaning capacity can the plant cleaning system produces in principle and in the dimensions of a tiny house?

[4] Can a tiny house fulfills the conditions for a plant cleaning system so that the system recycles sufficient water to supply the household?

For this series of tests at first I build a small functional prototype with sampling possibilities in various places, in which I give grey water from kitchen and bath in smaller amount. In these prototypes I use swamp plants that are used in swamp beds. These include Phragmitis communis/austral. | Schilfrohr; Iris pseudacorus | Wasserschwertlilie; Typha latifolia | Breitblättriger Rohrkolben; Acorus calamus | Kalmus; Scirpus lacustris | Flechtbinse and Juncus effusus | Sumpfgras.

For over a month I will give grey water from the sink and kitchen into the prototype and test the water quality after different times and in different places.

In a successful test (the water can be purified with plants in a certain period of time) I will work on the question, whether the dimensions of a tiny house (available area) are compatible with the requirements of a plant cleaning system and build a large functional prototype in the functional wall of my tiny house to answer the question about the sufficient amount of recycled water for the household of a tiny house.

During this experiment I publish articles for more informations. Please follow:


[ Experimentenreihe 2 | Cleaning with effective microorganisms]

Effective microorganisms consist of various, universally occurring aerobic and anaerobic microorganisms. The use of microorganisms for various purposes, such as the production of humus or lactic acid fermentation, has its origin in Japan and old traditional methods of working. I test in this experiment to what extent they are suitable for use in water purification.

[ Experimentenreihe 3 | Cleaning by precipitation ]

In wastewater purification precipitation is a common method in which dissolved substances are precipitated by the addition of precipitation medium to insoluble solids. The precipitation medium are in different ways accessible, sustainable and cost-intensive. Various are tried out and their effectiveness documented. Non-sustainable precipitation medium are excluded from the test.