Scaling UP! H2O

097 The One About Filtration on Cooling Towers

Nation! If you have listened to the show, you know that I believe that every system we treat should have a filter on it.  There is only so much that a water treatment program can do when mechanical filtration is not used.   

My guest today is Bryan Hayward.  Bryan is an expert on cooling tower filtration. 

Today’s show will teach you some things you may have never thought of.  From installation to operation, Bryan helps us understand this indispensable tool call filtration.



Heat Transfer Efficiency Managers

Importance of Filter Person

Filter on Cooling Tower 

Laser Particle Analysis 

Centrifugal Separator 

Sand Filter

High Efficiency Filter 

GPM Re-circulation Rate 

Installation Place

Tips from Bryan

AWT Annual Convention and Expo 



“If you have clean water, it’s going to help the water treatment program heat, the heat transfer surfaces clean and with minimum corrosion. If they try sand filters they gonna love them.” – Bryan Hayward

“It’s important for the water treater to work with the filter person and communicate with them and find somebody they can trust.” – Bryan Hayward

“Communication is really important, when something’s installed incorrectly, the filter will not work.” – Bryan Hayward


Links Mentioned:

Downloadable File: Cooling Technology Institute

Bryan Hayward on LinkedIn


Water Treatment education

3 Replies to “097 The One About Filtration on Cooling Towers”

  1. Hello, I liked the interview very much but there is an important point you missed which is to tell us what would be the recommended flow rate out of the cooling tower circulation which we should send to the filter. I always work with 10% of the total flow rate to go into side stream filtration. What would you suggest? Also what would you say about coalescent tangential filters instead of Sandfilters which need to be very big and spacy to handle the high flow rates at cooling towers which is a problem. I appriciate your advice. Thanks and brgds, Zlatko

    1. Hi Zlatko,

      I work with a filter vendor and our recommended sizing is based on turning over the water volume a certain number of times per day. The formula is as follows:
      System volume (gal) x desired number of turnovers / 1440 mins/day = capacity of micro-sand filter

      When city water is the make-up source we target 7 turnovers/day. When make-up is another source we target 10 turnovers/day or higher.

      And if the volume is not known by the customer then we use a 5% side-stream as a rule of thumb.

      Finally regarding the footprint. For larger filters (>700 gpm) our company has micro-sand filters with horizontal tanks that can be stacked with two on a skid. So the flux rate effectively becomes 50 gpm/ft2 of footprint used.

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