Bye, Bye, Flying Toilets, Sanitation is Main Part of RaHa Rainwater Harvesting

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Sanitation is the main part of RaHa. We provide hygienic, technological, financial, sociocultural, and environmental friendly option to dispose of human excreta.

Nominate a village, school or your garage for this.


We bring sani solar to families, schools and enterprises like car garages (‘jua kali’).


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At the moment of use, urine and feces are automatically separated by the urine-diverting user interface.

Feces fall into one of four containers, which are installed, on a turntable located in the drying chamber located below the toilet seat. Before leaving the toilet cabin, the user positions another container by moving the turntable with the help of the lever, placed in the cabin.


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The feces in the containers are quickly dried and stabilized by the combination of directional airflow and solar radiation in the drying chamber.




Considering daily use by 5 persons, the 4 fecal containers are emptied every 5-month only. This measure can be realized easily and hygienically safe by one single person without any special equipment. The disposal of the dried and stabilized residue does not generate a negative environmental impact.


The urine is conducted out of the cabin into the external drying unit where it is converted into a stable, high-quality plant fertilizer. This fertilizer is recovered by the user with the help of a spatula.


Why it makes the difference?

1,320 LB (601 kg) of human excreta are naturally converted into 36 LB (16 kg) of dried and stabilized residue and about 20 LB (9 kg) of plant fertilizer. All this without one drop of water, no electrical energy and no operational costs.

In contrast, the 601 kg of urine and faeces generated yearly  by one human being is, in some cases, converted to sewage by using 11, 000 litre of drinking water [through the common flushing toilet (WC)]. In many of the semi-arid regions of the world, this not only is a waste of precious recourses, but often also leads to environmental pollution and health hazards.


sani facts


Where to use it?


Our system is suitable as decentralized sanitation facility for all rural areas with warm arid or semi-arid climate (areas in map above marked in yellow and in green). For best performance it requires:

  • Low humidity
  • Intensive solar radiation
  • High evapotranspiration rate

There You Have it?

Hygienic: There still exist a large number of locations where the human right for access to improved sanitation facilities cannot be guaranteed. 960 Millions people still practice open defecation (UNICEF 2015). In its latest report on progress on sanitation and drinking water (2015), WHO and UNICEF stated that worldwide 2,4 billion people still lack access to improved sanitation facilities.




Health hazards caused by germs and parasites are the consequences of such circumstances which mostly affect children living in rural areas.

RaHa gives a hygienic and humane solution to improve the sanitary situation in rural areas, not only regarding the use but also regarding the safe disposal of the residues.

Technologically: It is sustainable due to its robust and durable technology. This singular drying toilet was specially designed to resist over a long period under the extreme climatic conditions characteristic for arid and semi-arid regions.


sani trim 1


It can be operated and cleaned by its users.

There is no need for maintenance.

Due to the Plug & Play concept, up to three units of it can be installed by a team of two persons.

Financially: Sustainable also means that a complete sanitary solution does not generate operational costs nor requires external service regarding maintenance or disposal of residues.

Sociocultural: Tests and surveys confirmed the excellent acceptance by women and men of any age.

User feedback examples: Isabel states, “It is cooler in the toilet than outside” | Francisco asserts, “No odors”

It is well ventilated, period!

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Environmentally friendly: The unique system is not only a conventional dry or waterless toilet, it solves the sanitation problem beyond a hygienic usage up to the treatment and sanitization of the residues. It works without water and electric energy, reducing residues to a minimum. Furthermore, it generates a hygienic fertilizer which is easy to handle and applicate.

The process involved in common water toilets would look like this.




RaHa is giving all the 5 steps in one facility!



Notice the more than 95% of mass reduction (see container below toilet seat, before and after drying).

In order to guarantee the efficiency of decentralized sanitation concepts, not only are toilet facilities needed, but also a range of measures, which assure safe handling, and disposal of the residues and if possible, the recovering of nutrients.

Based on those claims the so called sustainable sanitation system chain is here.

All 5 steps in one facility! Innovative, autonomous, 5 in 1

It merges all 5 steps of the sustainable sanitation chain in one single on-site facility. The system works without water, electricity or chemicals, so it can be run easily and safely by the user himself.

Conventional water or compost toilets

The operation of conventional water or compost toilets leads to considerable amounts of waste or residues, apart from the consumption of the corresponding resources.

The treatment of the feces operated by this technology does not only prevent pollution of the environment, but also the dissemination of diseases by flies, as those vectors cannot reach the feces within the system.

The sustainable operation of this technology has no need for any additional aids, the system does not require maintenance or technical service.

It does not only improve substantially and the health parameters of rural populations, but represents also a decent and hygienic alternative towards the frequently precarious conditions of existing makeshift solutions.

sani trimmed


For the successful implementation of sanitation projects in rural areas, the logistics are of crucial importance. The manufactured product is based on the LEGO principle, allowing an installation without failures.

In only 3 hours a unit can be mounted ready for use by no more than 2 persons. All system components are being delivered to the final destination on a pallet. 16 pallets can be transported by a truck or inside a 40” sea container.

Thanks to this conception it can be installed ten times quicker than conventional equipment.

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