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Membrane Challenge Studies and Cartridge Filter Systems

Public water systems with membrane and cartridge filtration systems for removing Cryptosporidium and Giardia must receive approval from the TCEQ to evaluate each membrane’s ability to remove pathogens. The membrane filtration systems impacted by this requirement are those that were installed or replaced after April 1, 2012.

Public water systems must conduct challenge testing for membrane and cartridge filtration systems that are installed to remove Cryptosporidium and Giardia. These tests evaluate how efficiently each membrane model or cartridge filter system removes pathogens and allows the TCEQ to establish a log removal value (LRVC-Test).

 Membrane and cartridge filter manufacturers must provide a non-destructive performance test (NDPT) and quality control release value (QCRV). The NDPT and QCRV help verify that all manufactured membrane models and cartridge filter systems that were not subject to challenge testing in the past will achieve at least the same log removal level as more current membrane models and cartridge filter systems that were challenge-tested.

Public water systems with membrane filtration systems will be approved for a removal-credit based on the lower of the LRVC-Test and the log removal value that can be verified through direct integrity testing (LRVDIT).

Challenge studies for the following membrane models and cartridge filter systems for Cryptosporidium and Giardia removal have been reviewed and approved by the TCEQ:

Membrane Systems

The following table shows the current membrane systems with their TCEQ-approved credit values for pathogen removal:

 Membrane 
Make and Model 

 Cryptosporidium 
Log Removal 

 Giardia 
 Log Removal 

 Date(s) Approved 
by TCEQ 

 Dow UF-SFD2880   3.76  3.76  August 3, 2012

 GE-Zenon 

 ZeeWeed 500D 

 6.2, deposition mode 

 6.1, feed-and-bleed mode 

 January 27, 2014 
 Pall Microza 620A MF   5.68   March 20, 2013 
 Siemens S10N UF   5.03   October 23, 2013 
 Pentair X-Flow Aquaflex HP    4.95, deposition mode  November 20, 2014  

 

Cartridge Filter Systems

The following table shows the current cartridge filter systems with their TCEQ-approved credit values for pathogen removal:

Cartridge Filter

Make and Model

  Cryptosporidium  

Log Removal

Giardia Log Removal

 Date(s) Approved  

by TCEQ

 Harmsco HC/170-LT2

 Cartridge Filter

 2.0

 3.0, Bin 1

 3.1, Bin 2, Bin 3, Bin 4

 (3.1 each cartridge filter,

 6.7 maximum for two in series) 

 January 18, 2013

 Koch Targa II UF

 Cartridge Filter

 4.6  June 26, 2013

 Siemens Memcor

 L10N and L20N

 UF Cartridges

 6.27  April 8, 2013

Any manufacturer seeking to distribute a membrane or cartridge filter in the state of Texas must send the challenge study for the particular model to TCEQ for review and approval prior to installation. Challenge studies may be mailed to the following address:

Texas Commission on Environmental Quality
Technical Review & Oversight Team (MC-159)
PO Box 13087
Austin TX 78711-3087

For more information about these requirements see Title 30, Texas Administrative Code, Section 290.42(g)(2)-(3). Exit the TCEQ

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