Share this page

Finally Available! – Stainless Steel Resin Traps

After many requests, Res-Kem now has stainless steel resin traps available!  So, in addition to our standard PVC and CPVC resin traps, we now offer them in 304SS and 316SS.

304 Stainless Steel Traps Each Rated for 210 gpm Flow
304 Stainless Steel Traps Each Rated for 210 gpm Flow


The end connections have Van Stone Flanges for maximum installation flexibility.  All stainless steel units are fabricated to the customer's exact dimensions and flow requirements.  Each unit is hydro-tested to 160 psig. 

Why You Need a Resin Trap?

Many water treatment processes use small granular, plastic, powdered, pelletized and/or crystalline media in a pressure vessel. Over the years, complex screens, slotted pipes, perforated plates, molded devices, etc. have been engineered to keep the media in the vessel. Through corrosion, chemical attack, thermal damage, rapid flow changes, system age and/or water hammer, these distribution systems will be damaged.

Example of a PVC Hub and Lateral Distribution System Installed in New Steel Tank
Example of a PVC Hub and Lateral Distribution System Installed in New Steel Tank

When the distribution systems are damaged, the ion exchange resin or other media will get into the water distribution system contaminating and/or destroying downstream RO membranes, expensive membrane filters, pumps, tanks, piping, processes and any product touched by this contaminated water.

Where Should You Install a Resin Trap?

A resin trap should be installed in the product water line of most resin and media based water treatment equipment like: Softeners, Dealkalizers, Condensate Polishers, Demineralizers, Carbon Filters, Sand Filters,
Portable DI Tanks, Greensand Filters,and/or Multi-Media Filters.

Also, a resin trap should be considered in the backwash lines of most ion exchange and carbon systems because temperature related flow changes can cause these expensive materials to be sent down the drain.  

What is a Resin Trap?

A resin trap is a simple, protective sieving device to insure ion exchange resin or other filtration media does not leave the water treatment equipment, and travel downstream where it doesn’t belong. It offers a stainless steel wedge-wire screen with slots small enough to retain upstream ion exchange resins or other filtration media. The number and size of the openings are designed to keep the pressure drop to a ∆P=2 psi at the rated flow rate. A clear acrylic sleeve or borosilicate glass will visually indicate whether there is an upstream problem. A small ball valve allows for recycling of resin or media after the problem has been repaired.

Since the slots in the wedge wire are 0.010 inches, 254 micron, a resin trap protects, but does not replace, downstream cartridge filters, bag filters and membrane filters which generally have a much lower micron ratings.

For Additional Information:
Technical and Sizing Information of a Resin Trap
Stainless Steel Resin Trap Bulletin
PVC and CPVC Resin Trap Bulletin 
Res-Kem's Complete Line of Industrial Water Treatment Equipment


Posted on November 8, 2013 by Tom Dupnik | Tags: , ,

How Can We Help?
Looking to service, replace, expand, or improve your water pretreatment system? Need supplies or replacement parts for your pretreatment water equipment? Let Nalco PTS help you find what you're looking for or contact Nalco for further assistance with all of your water pretreatment system needs.
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.
Privacy Policy
© 2016 Nalco
An Ecolab Company