Ultra-Filter Sock®

Stop harmful substances from entering the stormwater system

Catch basin protection under the drain is nice. It's practical. It's useful. And, it's out of the way and out of sight. But there are some reasons that above drain protection may be the better option.

The Ultra-Filter Sock represents the ultimate in above drain protection. With the different filter media options available, this product is capable of removing many different types of pollutants. In fact, it is the only product with that versatility.

The 9-foot long socks are placed in front of storm drains. The woven geotextile material allows water to flow through into the storm drain while the media inside of the unit removes pollutants.

Key Features:  
  • Use in front of storm drains, around downspouts, in gullies and ditches, or anywhere there is potential for harmful stormwater runoff.
  • Woven polymer casing allows water to pass through quickly while filtration media inside removes pollutants.
  • High UV rating allows extended life in sun and elements.
  • Available in 9-foot lengths. Units can be overlapped for longer coverage.
  • Looped ends allow units to be staked in place and also assist in transport.
  • Available with different types of media depending on which pollutant is present. (Multiple Ultra-Filter Socks can be used in a “treatment train” if the potential for more than one contaminant or a large quantity of a single contaminant is present.)
  • Option for heavy metal removal available.
  • Helps comply with NPDES, 40 CFR 122.26 (1999) and TMDL requirements.


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Media Descriptions

  • Activated Carbon: Excellent “polishing media”. Helps remove certain chemicals, hydrocarbons and odors.
  • Sorb 44: Used to remove oil and other hydrocarbons.
  • Sediment Removal: Recycled rubber media provides weight, keeps unit in place, allows maximum water flow.
  • Phos Filter: Excellent for removal of phosphorous.
  • Heavy Metal Removal: Custom filter media helps remove zinc, lead, copper and other harmful, heavy metals.

 WARNING: This product (Sediment Model - Part# 9457) can expose you to chemicals including Hexavalent Chromium, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.

Ultra-Filter Socks

Part # Description Dimensions in. (mm) Weight lbs. (kg) Where to Buy
9453 Activated Carbon 108 x 7 x 4 (2,743 x 178 x 102) 40.0 (18.0)
9455 Sorb 44 108 x 7 x 4 (2,743 x 178 x 102) 15.0 (7.0)
9457 Sediment Removal 108 x 7 x 4 (2,743 x 178 x 102) 40.0 (18.0)
9456 Phos Filter 108 x 7 x 4 (2,743 x 178 x 102) 66.0 (30.0)
9454 Heavy Metal Removal 108 x 7 x 4 (2,743 x 178 x 102) 35.0 (16.0)

More info / Downloads



Heavy Metal Removal Media - Data Sheet

Heavy Metal Removal Media Safety Data Sheet (SDS)

Article - Stormwater Drain Guards vs. Filter Socks vs. Catch Basin Filtering Systems

Frequently Asked Questions

Why would I use the Ultra-Filter Sock instead of one of your other stormwater management products?
The Ultra-Filter Sock has several distinct advantages that could prove to be a deciding factor in choosing it to protect your drain from incoming pollutants.  (1) Ease of use and installation - with the Filter Sock, you simply lay it down in front of a drain or inlet.  No hardware to install, no heavy grates to lift.  (2) Versatility - the Filter Sock has multiple filtering media options available which enables it to remove pollutants that a lot of other stormwater products cannot remove.  (3) Multiple media options - not only are there several media options available but you can use them together in a "treatment train" so you can filter out many different pollutants.


Why WOULDN'T I use the Ultra- Filter Sock instead of one of your other stormwater management products?
If a "clean" installation is a significant concern or the Filter Sock could pose a tripping threat to pedestrian traffic or an obstruction for street sweepers or other equipment, it may not be the ideal solution.


I have a 10' long curb inlet.  How do I protect it?
Since the Ultra-Filter Socks are only available in one length (9'), you can simply use multiple units when more than nine feet is required.  It is recommended that you overlap units to insure complete coverage/protection.