* Avancerede gråvandssystemer
* Aqua2use
* Atlantis Greywater
* Clearwater biofiltre
* Greyter Water Systems
* Hydroflow, Inc.
* Levende maskine
* Nexus Eco-Systems
* Orenco Systems, Inc.
* Rainmaker Resources, Inc.
* Sequoia EcoSystems International (SEI)
* Simple vandløsninger
* Gråvandsgruppen
* WaterWise-systemer