Chlorine Armageddon


As of today the wholesale price for a #50 bucket of 3” Tri-Chlor tablets is at $190.00. I see it retailing online for as much as $300. If you rely on 3” tablets for your pool route or your personal backyard pool the Chlorine Armageddon is upon us. With prices for Tri-Chlor doubling, it is safe to say that alternatives need to be found.

Because of 45% tariffs on products from China, importing 3” Tri-Chlor tablets was not an option for US suppliers in 2019. So the tablets were homegrown so to speak and recently the largest US producer of Tri-Chlor went up in smoke literally when Hurricane Laura hit Louisiana.
“In the Lake Charles region, dotted with chemical plants and oil and gas refineries, trouble began early Thursday at a BioLab plant that manufacturers chlorine for swimming pools and disinfectants.” -Forbes

The Bio-Lab plant produced about 40% of the nation’s Tri-Chlor and from some reports, it will be down until 2022 or longer. I read reports that it made over 2 million pounds of Tri-Chlor each year. That is a lot of product that has been wiped off the market. With fewer tablets available and with Tri-Chlor being the main way pool service companies maintain a Free Chlorine level in their service accounts, how we manage pools going forward will be forced to change.

What are some ways to maintain a pool going forward and use less 3” Tri-Chlor tablets and can it even be done? Back In the early ’90s when I first got started in the pool service industry we were not so reliant on 3” Tablets. In fact, they were not used nearly as much as liquid chlorine and gas chlorine in that era and that was a good thing because some of the side effects of overuse of tablets were not present back then.

One of the downsides of using 3” Tri-Chlor tablets is that it will add Cyanuric Acid to your pool, sometimes to levels that are above the recommended 30-50 ppm. For example, if you have a 20,000-gallon pool and use a full 50 lbs. bucket of tablets in one season because about 50% of that bucket was Cyanuric Acid you have effectively added 150 ppm of CYA to your pool. The effects of this are that the chlorine will need to work harder to be effective and you will also need to keep your chlorine level high at all times for it to be effective – around 10 ppm. This is because the Cyanuric Acid molecule will bind and unbind with the chlorine molecule to protect it from the Sun’s UV rays and if your CYA level is over 100 ppm this process will make the chlorine less effective as it is “tied up” in the bonding and unbinding process. This is known in some circles as “Chlorine Lock.”

One way to reduce your reliance on 3” Tri-Chlor Tablets would be to drain those pools with CYA levels of 100 ppm or greater and keep them in the 30-50 ppm range. Then you can switch over to using un-stabilized chlorine (a chlorine product without Cyanuric Acid in it) like liquid chlorine or cal-hypo. If that is not possible another option would be to continue using 3” Tablets but add an enhancer to each pool to extend the life of the chlorine in the water. There are several different types on the market and I cover these in other articles and podcasts.

Back to the early ’90s and I will explain how we were able to get through each week by using liquid chlorine. With the CYA level at 30-50 ppm, the chlorine would stay in the water for quite some time and be very effective against algae. But if the pool was larger and in the peak of Summer, 1-2 gallons of liquid chlorine would burn off before the week was over. In that case, we would leave a case of chlorine (4 gallons) at the customer’s house and they would add it mid-week or a few days after you serviced the pool. This worked pretty effectively, and it wasn’t too much to ask the customer to do this each week.

You can also use a chlorine enhancer like adding borates to 50 ppm or using a PoolRx or Nature2 system in the pool. Phosphate Removers and Enzymes also can help extend chlorine in the pool. Any of these methods will make the chlorine more effective and last longer. Meaning you can use less chlorine in a pool and still keep it algae-free.

With less Tri-Chlor available you will have to use this method of enhancers and alternate primary sanitizers like liquid chlorine and Cal-Hypo.

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