Alternate Filtration - Giardia


List of approved alternative filtration devices for meeting the requirements of the Surface Water Treatment Rule.

NOTE: These filtration devices have not been approved by the department for meeting the 2-log removal requirement for Cryptosporidium contained in the Long Term 1 Enhanced Surface Water Treatment Rule.

Caution: The proposed use of these devices requires careful and thorough consideration of the characteristics of the raw water which will affect its service life. Physical water quality parameters such as suspended solids, algae density, turbidity, particle size and relative numbers, Microscopic Particulate Analysis (MPA) test results are useful data. During the design process, the effect of dynamic operating variables, such as water hammer, air burps, startup and shutdown procedures, backwash events, or changes in flow rates should be considered. In addition, biological growth (slime) on the membranes may be a fouling factor. The need for pretreatment is an essential part of the design analysis.

Some of these devices provide extremely effective particulate removal, sometimes in excess of regulatory requirements. Removing particles smaller than giardia (less than 5 microns) or cryptosporidium (less than 3 microns) may significantly reduce expected service life. These devices are approved for use based on site specific conditions during the plan review process for a Public Water System (PWS) to meet the requirements of the Surface Water Treatment Rule (SWTR).

The devices listed here have been demonstrated as meeting the criteria established in the DEC's Field Directive #2947, dated November 1994, titled "Approval of Alternative Filtration Systems for Public Water Systems" for the removal of giardia-size particles. The giardia log removal credit listed is the credit allowed for filtration in accordance with the SWTR, as described in the State's Drinking Water Regulations 18 AAC 80. The approval of alternative filtration devices is regulated by the Drinking Water Regulations and Field Directive #2947. Copies are available by request.

A filtration device listed with the National Sanitation Foundation (NSF) for Cyst Reduction is acceptable (NSF Standard 53). Other products tested according to this standard may be acceptable based on supporting documentation. These devices must still be approved by DEC during the plan review process for site conditions unique to a PWS. Installation according to manufacturer's recommendations is usually required for design variables such as flow rate and allowable differential pressure. If a filter does not meet NSF standard 53, but is shown to remove at least 99 percent of giardia sized particles, it must also show the filter and housing are suitable for potable water. NSF standard 61 (or equivalent) meets this requirement. Note: NSF standard 53 includes the potable requirements of NSF standard 61.

This listing is not a guarantee of the availability of the product. Please contact DEC to get the most current listing and contact the manufacturer directly to obtain the most current information. These products may be available from vendors in Alaska . Please consult with your local water treatment vendor regarding these devices.

Rosedale Products, Inc. Rosedale Products of California Inc.
P.O. Box 958 , Coarsegold , CA 93614
800/821-5373, 209/683-6854, FAX 209/683-8172

Filter: GLR-PO-825-2 (bag filter)
Housing: Model 8-30, 304SS or 316SS; Models avail. in 100 psi or 150 psi
Max differential pressure: 15 psi differential
Recommended maximum flow: 20 gpm single filter
Giardia log removal: 2.5 log credit

3M Filtration Products
3M Center Building 60-1S-16; St. Paul , MN 55144-1000
888/203-9013 (Technical Svc: 800/648-6550)

Filter: 523A (bag filter)
Housing: HE-SS4-100-100-A (for 100 psi vessel)
or HE-SS4-100-150-A (for 150 psi vessel)
or HE-SS4-100-300-A (for 300 psi vessel)
Maximum differential pressure: 25 psi
Recommended maximum flow: 40 gpm single filter
Giardia log removal: 2.5 log credit

Filter: 525A (bag filter) Housing:
HE-SS4-100-100-A (for 100 psi vessel)
or HE-SS4-100-150-A (for 150 psi vessel)
or HE-SS4-100-300-A (for 300 psi vessel)
Maximum differential pressure: 25 psi
Recommended maximum flow: 40 gpm single filter
Giardia log removal: 2.0 log credit

Filter: 743B (cartridge filter)
Housing: 3M-SS4-100-100-B (for 100 psi vessel)
or 3M-SS4-100-150-B (for 150 psi vessel)
or 3M-SS4-100-300-B (for 300 psi vessel)
Maximum differential pressure: 25 psi
Recommended maximum flow: 40 gpm single filter
Giardia log removal: 2.5 log credit

Filter: 744B (cartridge filter)
Housing: 3M-SS4-100-100-B (for 100 psi vessel)
or 3M-SS4-100-150-B (for 150 psi vessel)
or 3M-SS4-100-300-B (for 300 psi vessel)
Maximum differential pressure: 25 psi
Recommended maximum flow: 40 gpm single filter
Giardia log removal: 2.5 log credit

Eden Equipment Company, Inc.
1485 East 3rd Street , Pomona , CA 91766
909/629-5106; Toll Free: 800/842-5081; FAX 909/629-0243

Filter: XL1GL120-1F (cartridge filter)
Housing: 1E1-3/4C125
Maximum differential pressure: Manufactures recommendation
Recommended maximum flow: 5 gpm
Giardia log removal: 2.5 log credit

Osmonics, Inc.
5951 Clearwater Drive ; Minnetonka , MN 55343
Jeff Fleming, 800/848-1750 x6763

Filter: Selex Model SXD-20ESS (cartridge filter)
Housing: Model HX 0120-.75T-A-222
Max differential pressure: 30 psi
Recommended maximum flow: 10 gpm for 20-inch filter
Giardia log removal: 2.0 log credit

Strainrite
P.O. Box 1667
48 Commercial St .
Lewiston , ME. 04241-1667
207-777-3100
1-800-487-3136

Filter: HPM97-GC-2SS (bag filter) Replaces 3M bag filter
Housing: AQ-2-2BSH (3M 525 or 523 series)
Maximum allowable differential pressure: 20 psi
Maximum flow rate: 20 gpm
Giardia log removal: 2.5 log credit

Filtration Technology, Inc.
307 Old Saybrook
Boise , Idaho 83706
208-336-6611

Filter: HPM97-GC-2SS (bag filter) Replaces 3M bag filter
Housing: 3M 523/525 housing or Strainrite AQ-2-2BSH
Maximum allowable differential pressure: 20 psi
Maximum flow rate: 20 gpm
Giardia log removal: 2.5 log credit

Harmsco, Inc.
PO Box 14066
North Palm Beach , FL. 33408
1-800-327-3248

Filter: PP-HC-170-1 (cartridge filter)
Housing: HUR-170-HP vessel
Maximum allowable differential pressure: 15 psi
Maximum flow rate: 100 GPM (varies with # of cartridges)
Giardia log removal: 2.0 log credit

Filter: PP-S-1 (cartridge filter)
Housing: HIF-7 vessel
Maximum allowable differential pressure: 15 psi
Maximum flow rate: 30 GPM (varies with # of cartridges)
Giardia log removal: 2.0 log credit

Filter: PP-D-1 (cartridge filter)
Housing: HIF-14 vessel
Maximum allowable differential pressure: 15 psi
Maximum flow rate: 50 GPM (varies with # of cartridges)
Giardia log removal: 2.0 log credit

Filter: PP-T-1
Housing: HIF-21, HIF-24, and HIF-42 vessels
Maximum allowable differential pressure: 15 psi
Maximum flow rate: 50 GPM (varies with # of cartridges)
Giardia log removal: 2.0 log credit

Filter: HC/170 LT2 (cartridge filter)
Housing: HUR 1X170FL or MUNI 1 2 FL-304 vessel
Maximum allowable differential pressure: 30 psi
Maximum flow rate: 100 gpm
Maximum influent turbidity: 1 NTU
Giardia log removal: 2.5 log credit

CUNO, Inc.
PO Box 1018
Meridian , Connecticut 06450-1018
(203) 238-8923
Distributor for Alaska is Filtrex, Inc (509) 535-8835 in Seattle

Filter: PolyPro XL Grade PBG 100&200 series (cartridge)
Housing: ZWC, ZWB, ZMS, ZVS , SD , and ZMO (All 316L)
Maximum allowable differential pressure: 30 psi
Maximum flow rate: 5 GPM per 10-inch cartridge
Giardia log removal: 2.5 log credit

Last updated 4/23/2013


For information contact:
Scott Forgue, P.E.
phone: 907-262-3417; fax 907-262-2294
email: Scott.Forgue@alaska.gov
Alaska Department of Environmental Conservation
Division of Environmental Health
Drinking Water Program
43335 Kalifornsky Beach Rd. Ste. 11, Soldotna, AK 99669