I am looking for companies that have experience with construction of household/farm-scale constructed/treatment wetlands in

- Eastern/southeastern Botswana,

- South Africa (around Pretoria and Cape Town),

- Namibia (Windhoek region) and

- Ghana (Kumasi region)

It would be about subcontracting the construction of horizontal subsurface flow systems for greywater/domestic wastewater/dairy farm washwater as part of an EU-funded Innovation project. If anyone can recommend some to me in the respective regions I would be very thankful!