Basics of Ultrafiltration

By Harv Scholz, P.E. Senior Mechanical Engineer | Pureflow, Inc. Ultrafiltration, also known as UF, is a class of filtration that uses a membrane, either in the form of a spiral wound element similar to a reverse osmosis membrane, or more often, a tubular element known as a hollow fiber. Other types of membrane filters are…

RO Membrane Cleaning

By Steve Siverns & Stephen Boles | Pureflow, Inc. Reverse osmosis (RO) membrane elements become fouled over time due to deposition on the membrane surface.  The membrane becomes blocked and the RO permeate flow rate decreases.  Often the permeate conductivity also increases due to minerals being concentrated even further at the membrane surface as they…

Instrumentation for High Purity Water Systems

By David Ferguson, Electrical Engineer | Pureflow, Inc. Instrumentation is a vital component of high purity water systems. Of equal importance is selecting the right instrument for the task at hand and keeping it maintained. This article will discuss some of the most common instruments installed on a water system and present basic application and…

30 Years and Counting

The Birth of Pureflow For over 30 years, Pureflow’s core values have been non-negotiable. The pursuit of our mission to provide uncompromising quality solutions to our customers is rooted in three strategic values that define us as a company: people, integrity, and excellence. Through attention to detail and impeccable customer service, Pureflow has developed a solid base of satisfied…

Why Sampling Is Important- Part 2

By Dr. Teri C. “TC” Soli, SoliPharma Solutions Poorly executed sampling is the cause of most excursions from microbial process control trigger values (Alert and Action Levels) and specifications. In Part 1 of this article we learned about the boundary layer phenomenon, how its depth is dramatically affected by water velocity, and how that impacts biofilm thickness. We also learned…

Why Sampling Is Important- Part 1

By Dr. Teri C. “TC” Soli, SoliPharma Solutions The maintenance and control of a water system to provide and distribute water of acceptable chemical and microbiological quality is undoubtedly the most important set of operations for a water system. A close second is sampling. So, why is sampling so important? Anyone involved in testing those…