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Cooling Water Biocides

Why are biocides used in cooling water?
Biocides are used to control bacteria in cooling water systems. Failure to implement a good cooling water biocide program may lead to bacteria and under deposit corrosion.

What is under deposit corrosion?
Under deposit corrosion occurs when bacteria occurring within the water system. Under this bacteria, corrosion occurs.

What are the most common bicoides used in cooling water treatment?
The most popular products are stablized chlorine bromide solutions, Isothiazolin, Gluteraldehyde, DBNPA, Terbuthylazine, Polymeric Quaternary Amine, and Carbmate. For more information, please down load the product bulletins.

What biocide should I use in my cooling water systems?
Open loop systems like cooling towers, always use an oxidizer such as a stablized chlorine bromide product. Optional non oxidizers such as Gluteraldehyde or Isothiazolin are fed on an on needed basis. Closed loop water systems typically will use Gluteraldehyde or Isothiazolin.

How much cooling water biocide should I treat to properly treat my system?
If you are starting off with a new open loop system, maintain a free and total chlorine residual in the recirculating water and perform bacteria dipslides weekly to monitor bacteria is the system. When bacteria levels increase above 10,000 parts, slug feed your secondary biocide (Gluteraldehyde or Isothiazolin) at the recommend dosage rate. For closed loop systems, monitor your bacteria with dipslides and add your Gluteraldehyde or Isothiazolin as needed.

What testing should I perform on my cooling water systems?
For open loop systems, perform a free chlorine test daily and dipslides weekly. For closed loop systems, just use dipslides weekly. If you are troubleshooting a very damage and fouled system you may require SRB test kits. Hardness tests and water conductivity sampling should be taken for reference in closed loop and kept for reference, while it should be a mandatory practice in open loops. You may also consider purchasing a complete cooling water test kit.

Should we use Gluteraldehyde or Isothiazolin in our cooling water system?
Gluteraldehyde is much safer is use then Isothiazolin. If at all possible use Gluteraldehyde. Gluteraldehyde comes in 15 and 45 % solutions, so for small water systems you may purchase the less concentrated product for safety concerns.

What is the difference between cooling water chemicals and cooling tower chemicals?
Cooling water chemicals are used to treat cooling tower systems. Some people with just cooling towers refer to the chemicals as cooling tower chemicals. If you have time, please watch some of posted cooling tower videos online.
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Polymeric Quaternary Amine Terbuthylazine Carbamate
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1.5% Isothiazolin - 5 to 55 Gallons 5% DBNPA - 5 to 55 Gallons Bromax 7.1 - 5 to 55 Gallons
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