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|Proven phosphorus retention <br> Retained phosphorus is stable||May harm plants (Logsdon & Sauer, 2016) <ref>Logsdon SD, Sauer PA. 2016. Iron Filings Cement Engineered Soil Mix. Agron J. 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 (Logsdon & Sauer, 2016) <ref>Logsdon SD, Sauer PA. 2016. Iron Filings Cement Engineered Soil Mix. Agron J. 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]]
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|[[Additives#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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