Little St. James SWRO Service Report: March 21, 2017 On March 15th through March 18'h 2017, Jamaal Hodge conducted an onsite service visit at the seawater RO system on Little St. James Island. The goal of this service visit was to perform the necessary work to resolve the following issues; 1. Reduce the overall feed water pressure of the existing high pressure Wheatley pump. 2. Lower overall conductivity on the SWRO permeate water. 3. Install a new Pre Treatment chemical feed pump. 4. Resolve the post treatment water quality issues. HP Pump PSI & Conductivity: In order to lower overall conductivity and reduce the HP pump pressures, the lead membranes in each vessel needed to be inspected for foreign objects and debris (FOD). This has been an issue in the past at this plant due to improper backwashing of the Multi Media Filters using high flows which allows the filter media to enter the discharge lines of the filters. When the MMF filters are returned into service, this media travels and is trapped in the cartridge filters. Unfortunately if this occurs, the filter housing needs to be properly flushed out and cleaned when filter cartridges are changed in order to keep the FOD from entering the high pressure pump and membranes. Unfortunately, this cleaning of the Filter Cartridge Housing has not been done, and the result is irreversible damage to both the high pressure pump, and the membranes. Upon arrival, the plant was operating at a membrane feed water pressure of 890 PSI with a concentrate pressure of 910 PSI. Please note that Maximum Operating Pressure of the membrane housings is 1,000 PSI. Jamaal changed out two of the lead membranes that were found to have FOD and mechanical damage cause by the FOD and installed new membranes into the final position of the vessels so as to insure the new membranes would not be overflowing permeate known as "Over Flux" when combining new membranes with older ones. This resulted in an overall pressure dro