White Papers & Glossary

An Introduction to Reverse Osmosis Pre-Filtration

RO filtration is used to remove the tiniest contaminants such as dissolved salts from water.   For example, RO is used for desalination – to create fresh drinking water from sea-water, or to purify fresh water to remove trace contaminants and make drinking water even healthier.  In industrial applications, RO is used  to remove harmful  scalants and damaging residues to minimize deposits in expensive boilers, or to recycle waste waters into water that can be re-used  for washdown, irrigation or evaporative cooling , thus prolonging the availability of freshwater resources.  Many of our customers and distributors have a lot more experience with traditional dead-end cartridge filters than with some of the more advanced forms of membrane filtration.  For newcomers to water purification, any discussion of Reverse Osmosis can be intimidating at first, but this paper is intended to facilitate effective discussions about pre-filters between buyers and sellers.

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String Wound Filters – The Best Pre-Filters?

On some levels, string wound filters might be considered to be of unsophisticated technology, but they are often the most intelligent choice. Experienced plant personnel and new-system designers select string wound filters because these filters have proven effective, because advances in the manufacture of string wound filters have continued to advance filter performance, and because this filter design continues to provide value (favorable price/performance ratio).

String wound filters are used for pre-filtration in a myriad of applications, ranging from protecting potable water systems using RO desalination membranes in large municipal water facilities to protecting under-sink RO units in home water systems; from cleaning up amine for gas sweetening in petrochemical plants to chemical filtration in a “tank farm” at pharmaceutical API (active pharmaceutical ingredient) plants; from ensuring circuit board quality in plating solution bath recirculation systems to protecting geological formations via water filtration in a geothermal plant.

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Basics of Filtration

This white paper includes definitions and descriptions of

  • Filtration
  • Separation
  • Pressure drop
  • System pressure drop
  • Cartridge Pressure Drop
  • Housing Pressure Drop
  • Open, Parallel and Series Filtration Systems

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Glossary of Produced Water & Fracking Terms

If you are in the liquid filtration industry but terms like “produced water” and “flowback water” are unclear to you, download and print out our Produced Water and Fracking Terms glossary.

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How to Prepare to Buy a New Chemical Filter Assembly

A properly functioning filter for a chemical process is usually one that has been carefully selected. Collecting the right information for a new filter assembly (housing and filters) lays the groundwork for all involved to thoroughly understand requirements.

Delta Pure Filtration has prepared a questionnaire to help with the filter selection process. Preparing answers to these questions will help you to get the right recommendation and pricing from your supplier, will significantly speed-up the quoting process, and might even provide you important new insights into your own process.

TIP: Special filter vessels can often take many months to design and fabricate, so it is best to plan ahead and order as early as possible.

Download the PDF Questionnaire and be prepared! »