Pilot Testing for a New Membrane WTP With no Feed, Filtrate, or Backwash Pumps

This paper describes how the City of Port Townsend, WA chose low pressure membrane filtration to comply with LT2ESWTR for Cryptosporidium removal. The system had to match the existing system hydraulic grade line (HGL) to supply the entire water pressure system by gravity. he City opted to conduct a two-step procurement process. The initial step was to procure piloting services to complete an initial five-month test. The system that ultimately was chosen successfully operated in the piloting and was purchased for installation