Low Chlorine Residuals

Low Chlorine Residuals


The SeaQuest Solution

Because SeaQuest can operate at a wide pH range, including as low as 6.0, the water can be maintained close to its natural pH to increase the effectiveness of chlorine where hypochlorous acid is predominant.

The sequestration of minerals, keeping them soluble, also has a dramatic effect on chlorine efficacy. Chlorine is a strong oxidizer and does not actively select what to oxidize. Minerals like iron are commonly found in drinking water systems, either naturally or from corrosion. SeaQuest keeps this material in solution, which prevents it from being oxidized by chlorine. Thus the maximum amount of chlorine is available to perform disinfection in SeaQuest systems, resulting in higher residuals in the distribution system.

What leads to Low Chlorine Residuals ?

All drinking water systems use some type of strong oxidizer to kill bacteria and make the water safe to consume. Bleach, gaseous chlorine, and chloramine are commonly used. Typically free chlorine is measured at the furthest points in the distribution system to ensure there is adequate disinfectant.

Many systems suffer from low chlorine residuals, especially far out in the distribution system. Non-biological chlorine demand and elevated pH are the most common causes of low residuals. At alkaline pH, more hypochlorite ion is present than hypochlorous acid. Hypochlorite is a much weaker disinfecting agent, so more chlorine is required. More chlorine increases the corrosivity of the water.

Low Chlorine Residuals

Dave is the Vice President and General Manager of AquaSmart, and a Chemical Engineer.

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