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|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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![[Red sand]]
![[Red sand or Iron-enriched sand]]
|Proven phosphorus removal <br> Also removes TSS||Poor orthophosphate removal in hypoxic or anoxic conditions
|Proven phosphorus removal <br> Also removes TSS||Poor orthophosphate removal in hypoxic or anoxic conditions
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