School Projects

Using the Howard-Higgins Horticultural System, GGI have developed a complete “package” for an average rural school of 500 pupils and staff. The package can be adjusted for any size school or community and comprises the following:

HH-3 DRY Toilets

 Two HH-3 DRY Toilets per 50 users (OXFAM recommends one toilet per 50 users) are installed onto a structure in safe, secure and private cubicles. These toilets are used in rotation so that 10 are operational at any one time. The structures will be constructed using local materials and labour, and can be positioned in different locations around the school.

HH-2 Hot Boxes

 10 pairs of HH-2 hot boxes are located beneath the toilet structures so that solid waste matter is deposited directly into them.

The Process

On a daily basis the Hot Boxes are  monitored in a hygienically controlled environment by staff, other school members or external staff. Additional “ingredients” are locally sourced and added according to the local training programme.

Every 14 days the waste is removed from the HH-2 boxes and piled on the ground under controlled conditions, including a turning and watering regime. At the 30 day period pathogens can be tested for. None have ever been found. The human waste collection continues in this 14 day cycle.

90 days after starting the process the finished product, HH-4, can be correctly applied to the (barren) land.

After the first plantings of fruit and vegetables have been made the system can continue into the future.

If operating at optimum inputs a school of 500 pupils should produce 120 tons of HH-4 a year. Even if only operating at 50% input capacity the annual output will be 60 tons.

This means that between 6,000m² and 12,000m² of previously barren land would be covered and made productive.

Applications of HH-4 are repeated annually over about 50% of the land, depending on the type of crop being grown. This means that, after around 4 years, there will be a surplus of HH-4. This can be used to fertilise new land. Alternatively the surplus HH-4 can be sold for a profit giving the school an extra income. There will be a high demand for such a productive soil enhancer.

This area of productive land will continue to grow crops on an ongoing basis without the need for any further investment.

The school package would include all the hardware required to operate the system. The toilet structure would be constructed on site using local materials under the direction of the GGI project manager.

The “special” ingredients required to activate and produce the remarkable HH-4 will be sourced locally. They are easy to source and over time this may develop into another income producing opportunity.

There are potential employment opportunities, pupils could be educated in waste management and sound agricultural methods and the entire community would benefit from the healthy crops. Such educated young people would then help to spread the message of such good agricultural practice.

The additional benefits to the school are:

  • Huge water savings as the toilets require no flushing
  • No ground water pollution
  • Improved health with better sanitation
  • No requirements for a costly sewage disposal system
  • No requirements for costly agricultural chemicals in crop production.
  • Increased crop production due to reduced pest infestations
  • Better water retention means less water required for irrigation
  • With Improved soil health follows improved nutrition for the school children

The cost of a complete School Package will vary depending on, school size, circumstances and location. These costs include all the equipment delivered to site, salaries of the staff, travel accommodation and food, and local costs of labour and materials for local construction.

Community Projects

This model is similar to the school model except that the HH-3 DRY Toilets can be separate from the HH-2 hot boxes and can be fitted in individual homes.

An average household of 5/6 persons will require a single HH-3 DRY Toilet with a spare bucket, including a bioliner. The bucket will be collected/replaced on average twice per week. A pair of HH-2 hot boxes will handle the waste from 12 homes.

With the addition of other suitable organic wastes (including all other household organic waste, food etc) the HH-2 pair will produce approximately 3,000kgs of HH-4 every 90 days. Therefore every year a single pair of HH-2 will produce 12 tons (12,000kgs) of HH-4. This will cover around 6,000 m² (.67 acres) of previously unproductive land.

It will require 2 people to manage one complete HH-2 system, from collection and production to distribution of the HH-4. By scaling this up the following results could be achieved:

A rural population of 5,000 people represents around 800 households. They will require:

800 HH-3 DRY Toilets

66 pairs of HH-2

This will provide an income opportunity for 140 people/agriculturists. This income would be achieved through sale of the crops and for the waste collection services.

The benefit to the population will be 84,000 m³ (21 acres) of highly fertile and nutritious food growing land. After around 4 years of treatment additional land can be treated with the HH-4.


Good Gardeners International have found from our surveys in three African Countries that children, even in fee paying schools, are not fed leafy green vegetables in their diet. There are many reasons, from bad soil to lack of knowledge or simply because the school cannot afford to pay for the chemicals needed to keep off the pests and diseases  that attack these plants.

We, the Good Gardeners, have the complete solution to this problem.

With our HH-2 Horticultural System any school can grow its own fruits and vegetables with a much higher standard of nutrition than conventionally grown food because we do it completely organically and without digging the soil. This improves the microbial life in the soil, and the all important soil structure. With the right fungi and bacteria introduced into the soil the health of the plants will be become apparent as they will not be ravaged by pests and diseases. The health of the children and the staff in each school will also improve.

With your help we can make this happen. The Nutritional quality of their diet will change and the children’s full capacity for development will be realised. Plus they will be learning the most important skill of how to produce their own healthy, pest and disease free, food. Please contact us if you wish to donate to this African Schools project.