Is Secondary Sanitation Necessary? A new STUDY sets out to prove a simple truth...

Ladies and Gentlemen:

As we gear up for the Final Review and Publication of the Model Health Code, the Mandate for Secondary Sanitation for Crypto Control will befall on all Aquatic Venues requiring this technology.  With that in mind, I want to pose a simple question...


Why Ask?

It came to my attention a few years ago when the mention of a Study regarding Crypto Inactivation using ORP technology, rather than Residual Chlorine measurements, was conducted by Dr. Ebba Lund, a renowned researcher of ORP and inactivation rates of RWI's in Water.  This research concluded that, by way of ORP control, Cryptosporidium can be inactivated at a given ORP value, regardless of a specific Chlorine residual.  This study also showed that the required residuals were FAR less than that previously indicated by the CDC.  at values as low as 17ppm, it achieved a 4log inactivation of Crypto (99.99%).

Obtain your copy of the Study HERE 

(Due to Licensing and Intellectual Property Laws, This Study's current owner - the AWWA, will allow you to see it by way of purchase)

You see, ORP is a QUALITATIVE measurement of a Sanitizer/Oxidizer in water.  Over the years, This distinction became confused, as Controller Manufacturers made a futile attempt to distinguish a relationship between the ORP value on the controller, with a given Sanitizer residual; this created much controversy, and in time, made ORP seem unreliable to an Industry looking for consistent chlorine residual.  Today, with the advent of the Amperometric Sensor, ORP is beginning to take a back seat in the Controller Industry.  And with that, Chlorine has become the "bad guy" in Water Sanitation.

Today, Dr. Lund's findings are creating doubts over the validity of the CDC's original findings on Sanitizer residuals and Crypto Control, and with that, a very large doubt as to whether we really NEED Secondary Sanitation.  Can Chlorine do the Job that the CDC says it cant?  I'm about to find out.  With the Advent of High Capacity Feed Chlorination, or HCF, its becoming clearer to users of the technology that its actually possible to reach the ORP values indicated in the ORP/Crypto Study, with far less residuals than published.  Currently, HCF pools can achieve ORP levels as high as 850mV, while maintaining PPM values less than 3ppm.  Can Ebba Lund's 865mV ORP "Spectrum" be achieved, with an ACCEPTABLE Chlorine residual?

It is my belief that:

  1. An 865mV ORP level can be maintained, while realizing a Health Department Approved Chlorine Residual, ONLY by way of an HCF System.
  2. A pool maintaining this ORP level will in fact, achieve the Mandated Protocols for Crypto Inactivation, but IN THE BULK POOL WATER
  3. A system that can create the above conditions in multiple locations, should be THIRD PARTY VALIDATED to meet or exceed the EPA's Mandates, but IN THE BULK POOL WATER.

So, How do you set out to prove this?:

  • PHASE ONE: Achieve the 865mV "spectrum" of ORP control, in multiple facilities, utilizing several chlorination methods (in this case, Bleach, Cal Hypo, and In Line Salt Generation) while maintaining a chlorine residual ACCEPTABLE to the Health Departments (less than 5ppm), using an HCF System by Link Automation/Chemtrac.  Here, the objective is to see "how low can you go?" in Residual.
  • PHASE TWO: Actively test these waters for Crypto Inactivation rates, and verify an inactivation rate of 3-log (99%), or better.
  • PHASE THREE: Once the above conditions are verified, Go for THIRD PARTY VALIDATION of EPA standards for CRYPTO Control, specifying that the BULK WATER is the Basis of Control.

Sounds intriguing, right?

A couple of other things; By way of HCF, these pools will also:

  • Keep Chloramines at bay, due to the high rates of ORP available to the water.
  • Maintain better water clarity than before installing HCF, because the High ORP will allow better microflocculation of the water, a skill rarely allowed for chlorine to show us.
  • Be more bather friendly.

Be sure to check in on updates as they come in. 

For more information on the HCF system by Link Automation/Chemtrac, check out our HCF page at .

Views: 290

Reply to This

Replies to This Discussion

I would like to Introduce the First 3 of the 6 candidates for The trials.

  • The Lennox Hill Neighborhood House swimming pool already Incorporating an HCF System comprised of a Link Automation Controller, and eduction feeds for both Bleach and CO2.  Located in New York City.
  • The Wayne YMCA is Home to the "Triple Play" of HCF systems; Link Automation controller, Followed by Eduction Feeds for Bleach, CO2, and Muriatic Acid (dosed simultaneously to provide both pH and Alkalinity Control).  Featured last year in my Chloramine Reduction Study. Located in Wayne, NJ
  • Maywood Fitness and Wellness Whirlpool: An Inline Salt System, with Bleach Backup, and CO2 with Static Mixing can reach HCF parameters, Chemtrac Controller with Remote Access allows Data logs of Free Cl, ORP, and pH; Achieving the 865mV spectrum here will be significant, as this is a situation where Secondary Sanitation will be mandated according to the MAHC. Located in Hackensack, NJ.

Be on the lookout for the other three candidates for the Phase ONE trials of this study. update is due...

10 pools have joined the phase 1 trial. All are achieving the target ORP level, and, as expected, are maintaining a residual that is consistent with the DOH standards for chlorine residuals in the pool's respective territory; we are seeing a range of 1.9 - 3.0 ppm free chlorine residual!

A side note: one of the pools had a very impatient operator...who took it upon them self to take a sample of their water to a prestigious university lab, and decided to see for them self if this study had any validity. The Result: let's just say that crypto has a new (but old) adversary in the pool industry...inbox me for details!


© 2019   Created by AI Connect.   Powered by

Badges  |  Report an Issue  |  Terms of Service