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An Introduction to Chlorine Residuals | Kasco Weblog


Sustaining a Free Chlorine Residual in Your Distribution Programs

Written by Thom Tackman, Kasco Marine Licensed Water Operator


Have you ever ever smelled chlorine in your reservoir and/or on the buyer’s faucet? Oftentimes, our first response to a style and odor criticism is to check the water for a free chlorine residual. On this article, be taught the most important causes of elevated chlorine residual and find out how to scale back it with energetic mixing.

Investigating the Chlorine Scent

Within the mid-Seventies, whereas working in Illinois, I used to be taught to imagine {that a} free chlorine residual in a spread from 0.5 PPM to 1.0 PPM was enough and that retaining a free chlorine residual in that vary would remove chlorine odor complaints from end-users. However even when the chlorine residual was met in these parameters, buyer complaints would nonetheless enhance beginning in late Could and proceed by way of October.

In 1986, my household and I moved to Arizona, and I started working at a brand new 24 MGD water remedy plant in Mesa. Quickly after shopping for a home in 1987, we put in a 12,000-gallon yard swimming pool. We took nice delight in retaining that pool clear and sustaining the really helpful 2.0 PPM free residual. It appeared although, that after our household of 5 spent a day within the pool, the chlorine odor would out of the blue seem. After this had occurred a number of occasions, I spoke with the chemist on the water remedy plant and my good buddy Matthew Rexing who instructed me that if I smelled chlorine on the pool to only add extra chlorine and the odor would go away.

Matt Rexing is a water high quality skilled and probably the most educated chemists I’ve ever identified. So when Matt instructed me find out how to scale back the chlorine odor from my pool, I adopted go well with. Certain sufficient, including a tad extra chlorine helped to remove the odor. However why did it assist in the pool? And would chlorine assist scale back buyer “odor” complaints within the potable water business?

To reply this query, we first must ask what causes chlorine odor and what are the symptoms. Seems that by testing the water for each free & whole residual and understanding what the outcomes of the take a look at are indicating, we are able to confirm what our nostril already is telling us.

Learn how to Check for Chlorine Residual

When testing for each free and whole chlorine residual, the whole residual studying ought to at all times be equal or barely better than the free residual. Usually, when the free and whole residuals readings are shut, that signifies good water high quality. Your take a look at outcomes ought to learn someplace between 0.5 PPM and 1.5 PPM in potable water or 1.0 PPM to three.0 PPM in pool water.

If the distinction between the whole and free residual is the same as or better than one-half of the free residual chlorine, the odor could also be current regardless that a measurable free residual is current. For instance, if the whole residual studying is 1.5 PPM and the free residual is 1.0 PPM or much less, the distinction is 0.5 PPM or better and the chlorine odor is most definitely noticeable.

So what Causes the Variations in Free and Complete Chlorine Residual Readings?

In a swimming pool, it’s the variety of human our bodies, suntan lotion, time spent within the water, beer that’s spilled from the floating chair, and the occasional tinkle from the child that decides to pee within the pool. In consuming water, it’s ammonia-nitrogen compounds from the supply water (or the organic exercise occurring within the biofilm), iron micro organism discovered contained in the distribution piping, and water storage tanks together with the temperature variances because of stratification. Usually as the times get longer, the ambient temperature will increase within the water tank because of the direct daylight on the reservoir construction, and this straight contributes to organic exercise. Stratification additionally influences the water age; because the water will get older the chlorine residual decreases.

Energetic Mixing Reduces Chlorine Residual

Within the spring of 2020, a water system supervisor in Indiana confirmed that putting in a sturdy energetic mixer helped immensely in decreasing the stratification within a 2.2 MG partial inground concrete potable water reservoir. The collected discipline knowledge revealed that after the water temperature and chlorine residual grew to become constant all through the contents of the water reservoir, the odor of chlorine odors dissipated.

Testing exhibits {that a} strong energetic mixer does scale back the mixed residual, which reduces the variations within the free and whole readings. Briefly, mixer off, mixed residual elevated leading to chlorine odors. Mixer on, mixed residual dropped leading to a discount of detectable chlorine odor. Keep tuned for the ultimate launch of the examine coming quickly.

Subsequent time you search for an answer to enhance water style and odors, take into account putting in a cheap Kasco CertiSafe™ Mixer. Simply comply with your nostril to the water high quality consultants at Kasco Marine. And your nostril and your prospects’ noses will thanks.


Concerning the Writer

Thom Tackman has over 40 years of business expertise in upkeep operations, water/wastewater course of management, water and distribution operations, and wastewater assortment system operation. He has hung out each as a licensed operator within the discipline, but in addition as a college-level teacher and educator specializing in water and wastewater operator certification overview, disinfection, and regulatory necessities.


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