All human excreta must be routed into a blackwater composting system. Permanently, all excreta needs to go into a blackwater composting system. Any of this category of building that doesn’t already have a water recycling system in place must become a net zero water user. Salesforce Tower has a blackwater recycling system that takes the building’s blackwater and recycles it into non-potable uses, such as toilet flushing and irrigation. Upgrading a system like theirs into “toilet to tap” is much simpler and less expensive than remaking their entire system with composting toilets.

Source: The Guardian December 22, 2023 18:03 UTC