Cornish council presses for filtration specs, weighs RO against greensand and ion exchange

An extended discussion at the Cornish Town Council meeting centered on how best to treat the town's water as the town moves into phase 2 of its water project. Council members expressed concern about technical recommendations from the design team and asked staff to gather state filtration specifications and multiple vendor bids before committing to a solution.

Margie, identified in the transcript as a community planner and administrative advisor, presented technical background from the state and grant programs and urged the council to use the capital-assessment self-inventory as part of funding preparations. "The self inventory is completed by city, town staff, and elected officials," Margie told the council, noting the town should submit the form by March 3 to position itself for CIB opportunities.

The meeting then shifted to a substantive debate over filtration technology. Engineers working with the town reportedly recommended a reverse-osmosis (RO) approach; several council members said the design team (referred to in the discussion as Mark and Max) had consistently pushed RO. "Max just kinda keeps coming back to you gotta have the RO," said an unidentified council member. Other participants cited the state's advice that greensand-plus (paired with continuous chlorination) or ion exchange could address Cornish's combined problems of high total dissolved solids (TDS) and manganese while presenting different operational tradeoffs.

Council members and staff identified three technical options discussed with the state: RO, greensand-plus with continuous chlorination (for manganese and hydrogen sulfide), and ion exchange for nitrates. Participants raised the main operational objections to RO: higher ongoing operational and maintenance costs, brine waste disposal, and the need for continual run-time to keep RO membranes functional. Greensand-plus was described as effective at removing manganese and hydrogen sulfide with a continuous oxidant feed but requiring a different pH management approach and, potentially, stacked units for flow capacity.

The council also focused on long-term serviceability. Members repeatedly asked where vendors would be located and whether local staff could maintain the chosen system. "If they're in Arizona, then we got a problem," one council member said, noting the practical difficulty and cost of getting remote technicians to the town for repairs. Participants emphasized the need for systems that local technicians (for example Clayton or Glen) could reasonably service or for clear service contracts with nearby firms.

Council directions and next steps recorded at the meeting were procedural rather than final decisions: staff were asked to contact the state filtration experts (identified in the transcript as Sarah/Paige), request written specifications and standards, invite the state to consult with the project engineer and vendors, and solicit multiple bids that reflect both RO and non-RO options. The council also discussed funding sources (CDBG and CIB were mentioned) and expressed a desire to avoid building a system the town could not maintain or afford to operate.

The most immediate operational details recorded during discussion: the council tested the pump and generator, confirmed a planned weekly exercise run for the generator, and discussed the logistics of running RO units and their maintenance schedules if RO were selected. No formal vote to choose a filtration technology was taken at the meeting. Instead, the council closed the discussion by directing staff to return with specifications, comparative bids, and a clearer maintenance plan before authorizing phase 2 procurement.

What happens next: Staff will contact the state filtration experts and assemble specification documents and vendor quotes; the council expects to review those materials before authorizing the next contract phase.