Decision time soon for water solutions

Published: Thursday, March 20, 2014 at 09:46 AM.

The CDM study, which is being finalized with city staff comments incorporated in the final draft, identifies several potential solutions and recommends changing the corrosion control chemical used in the treatment while also increasing the strength of the solution.

The corrosion control chemical’s impact on aging cast iron pipes has long been identified as the primary culprit for red water.

“This is a small problem that we think will solve itself over time as the pipes are replaced,” said city manager Jim Anderson. “But we know the problem is there.”

Lowering the levels of manganese could be addressed through options both early and late in the treatment of the water, to both segregate it within the system and by increasing the purity of a specific treatment chemical.

A tricky part to manganese treatment, Kozan noted, is the chemical tends to accumulate in stagnant areas of the line, increasing the likelihood of water discoloration.

The city’s flushing program, which commissioners implemented year round last year, is a significant factor in alleviating the problem.

“A regular high-velocity flush will also regulate the levels and the accumulation,” Kozan said.

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