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|Documented total phosphorus removal of up to 71%<ref>Hood A, Chopra M, Wanielista M. Assessment of Biosorption Activated Media Under Roadside Swales for the Removal of Phosphorus from Stormwater. Water. 2013;5(1):53-66. doi:10.3390/w5010053.</ref>||[http://boldandgold.com/index.html Proprietary]
|Documented total phosphorus removal of up to 71%<ref>Hood A, Chopra M, Wanielista M. Assessment of Biosorption Activated Media Under Roadside Swales for the Removal of Phosphorus from Stormwater. Water. 2013;5(1):53-66. doi:10.3390/w5010053.</ref>||[http://boldandgold.com/index.html Proprietary]
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![[Iron filings (zero valent iron)]]
![[Iron filings (ZVI)]]
|Proven phosphorus retention <br> Retained phosphorus is stable||May harm plants<ref>Logsdon SD, Sauer PA. Iron Filings Cement Engineered Soil Mix. Agron J. 2016;108(4):1753. doi:10.2134/agronj2015.0427.</ref> <br> Removal efficiency declines with increased concentration of incoming phosphorus
|Proven phosphorus retention <br> Retained phosphorus is stable||May harm plants<ref>Logsdon SD, Sauer PA. Iron Filings Cement Engineered Soil Mix. Agron J. 2016;108(4):1753. doi:10.2134/agronj2015.0427.</ref> <br> Removal efficiency declines with increased concentration of incoming phosphorus
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