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Pretreatment Solutions Blog

For over 9 years, Nalco Pretreatment Solutions has been presenting a unique perspective on the water industry, systems and technologies, from very technical applications information, to general business topics. Our overarching themes include Safety, Saving Energy, Saving Time, Saving Water, and how our Services, Systems and Replacement Parts achieve these goals. On a routine basis, we add information on our services, systems and replacement parts and show how they are important to your company.

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Boiler Feed Water Flow Rate Requirements Chart >

Question: We received a request for proposal today for “a water treatment system to treat the water going into my dual 194 HP steam boilers”. Start of an Answer: The first thing we need to do is estimate the amount of water that will be used. The question is how? After you work in any


Problems with a Bruner(R) Softener Multi-Port Valve >

Here are some common problems we see with very old Bruner(R), Bruner-matic(R), and Culligan(R) Hi-Flo (TM) multi-port valves. A recent request for help prompted this posting. Problem: I have an old Bruner softener with a large cast iron multi-port valve. Here are some of the issues: Periodically my brine tank overflows My runs seem to


How Does a Softener Valve Nest Work? >

The “valvenest” for a water softener is made of a minimum of six valves. The easiest way to understand how the water and brine flows through the valvenest is to see this picture. The top flange attaches to the upper side port of the softener tank. This in turn connects to the top distributor. The


My backwash flow rate is too high for my well and well pump >

A common design issue for sand filters, multi-media filters, greensand filters, arsenic removal units, etc. is the large difference between the backwash flow rate and the flow rate during normal operation. Depending upon the media used, the backwash flow rate can be 2X to 10X the service rate. Due to restrictions in the piping coming


Why should I treat my boiler condensate? >

Question: Why should I treat my boiler condensate? Our Answer: The reason why to treat your boiler condensate is condensate systems always leak. Heat exchangers are where most of the leakage problems start. Tube sheet and tube leaks, of shell and tube heat exchangers, are the typical cause. This is where untreated cooling water can


What is an Empty Bed Contact Time (EBCT)? >

Question: We receive many questions on calculating the Empty Bed Contact Time as follows: “How do I calculate the “Empty Bed Contact Time” for sizing my carbon bed?” Our Answer: Calculating the Empty Bed Contact Time, EBCT, is fairly easy to do once you know that the EBCT has the units of time, and usually


Bacteria in RO System >

Question: “I am getting some bacteria coming out of my RO that I was not getting before. How can I clean the membranes.” Our Answer: You can use a product known as Minncare® or Oxonia. Both are sanitizing agents made up of hydrogen peroxide and peracetic acid. Dilute to 50 – 100 ppm, pump through



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About Pretreatment Solutions
Nalco Pretreatment Solutions (PTS) is a leading manufacturer and supplier of services, systems and supplies for industrial and commercial water pretreatment systems for treating process water, product water, boiler pretreatment, and drinking water.
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