Biochar Filter Socks

Versatile treatment deployment.

Our filter socks are filled with our filter media for removing heavy metals including zinc and copper.  The filter socks have also been shown to reduce both TSS and Turbidity.

The standard socks are 3', 6' and 10' long in an 8" diameter tube that is filled roughly 75% full with BiocharBASIC™.

Custom lengths, tube size (8", 12" or 18" diameter), filter medias and fill percentages are also available.

Non Biochar Standard socks available with StormwaterZEOLITE™ and POZ300™.  See Pure Rain™ Filter Socks for more information on these.

BiocharBAZIC™ and BiocharPEAT™ are available as custom fill order. 

Our filter socks can be used in many different ways.  They can be used to treat sheet flow or placed in vaults or containers or in swales, anywhere the need for the ease of placement and removal in water flow.  When used on a hard surface, they are short and wide to give the most contact of the media as possible.

The sock material is a high flow material that is designed to hold up to UV and extended contact with water and contours very well to each surface giving more opportunity for the water to flow through the treatment media for the best results.

 

Sheet Flow down an open ditch with Filter Socks filled with

February 2026 Customer Test Results Before vs. After Implementation of eight each ten foot Filter Socks.

Pollutant Before After Percent Decrease
COD 134 103 23.1%
Dissolved Copper 6.5 µg/L 5.53 µg/L 14.9%
Dissolved Zinc 43.3 µg/L 22 µg/L 49.2%
Total Zinc 237 µg/L 57.5 µg/L 75.7%
Aluminum (Al) 3110 µg/L 1640 µg/L 47.3%
Iron 4500 µg/L 2270 µg/L 49.6%
Total Suspended Solids (TSS) 106 26 75.5%

Sheet Flow around a Catch Basin   

Date of Test
Pollutant Tested
% Change
PRE
Treatment
Unit of Measure
POST
Treatment
Unit of Measure
1/28/20
Copper

75%
387
 µg/L
95.8
 µg/L
1/28/20
Zinc

75%
2880
 µg/L
708
 µg/L

Bioswale Treatment, 20 socks throughout the swale  (15)  &  (5)

Date of Test
Pollutant Tested
% Change
PRE
Treatment
Unit of Measure
POST
Treatment
Unit of Measure
2/4/20

Iron

62%
3500
µg/L
1340
µg/L

 

Four Socks standing in a catch basin

Date of Test
Pollutant Tested
% Change
PRE 
Treatment
Unit of Measure
POST
Treatment
Unit of Measure
3/6/20

Aluminum

73%
1000
µg/L
270
µg/L
3/6/20

Copper

62%
12
µg/L
4.6
µg/L
3/6/20

Iron

44%
1800
µg/L
1000
µg/L
3/6/20

Lead

89%
5.3
µg/L
0.59
µg/L
3/6/20

Zinc

73%
77
µg/L
21
µg/L

 

 

Treatment Solutions

Our Filter Socks can be utilized for treatment at these and other types

  • Sheet Flow
  • Ditches
  • Swales
  • Catch Basins
  • Vaults
  • Treatment Boxes

 

Two logos, One for Biochar Media filled socks and One for Non Biochar filled socks.

     

"Since switching to Biochar (filter socks) in January we’ve seen a 93% decrease in our copper and zinc concentrations, a 91% decrease in our aluminum and iron concentrations, and a 77% decrease in TSS. Thank you for helping us..."

Kelsi B., California

April 2023

 

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