Vacuum Toilets

Highly efficient vacuum system.

  • After 7 years of operation, the composting toilet system was removed in 2021.
  • The vacuum system uses 70% less water than a standard flush toilet. 

After seven years, the Bullitt Center removed its innovative composting system and replaced it with a vacuum flush system (Read about the decision and key lessons learned here).

The vacuum flush system is highly efficient, using just .4 gallons of treated greywater per flush. The vacuum pumps pull waste through a grinder to eliminate problematic solids before moving them into a collection tank. From the collection tank, waste goes into the King County sanitary sewer for treatment. Like in the composting system, solids from the sewage treatment plant are converted into a human “bio-solid” called “Loop,” which can be used as a fertilizer.

Next building feature: Greywater System