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[[File:Redsand.jpg|300px|thumb|Iron-enhanced sand filter media adjacent to a wet pond (Minnesota Stormwater Manual)<ref>Minnesota Stormwater Manual. https://stormwater.pca.state.mn.us/index.php/Design_criteria_for_iron_enhanced_sand_filter</ref>.]]
===What is it?===
===What is it?===
Red sand, also known as a "Minnesota filter", is iron enhanced sand designed to capture soluble [[phosphorus]] that generally passes through a typical stormwater management facility. Iron has an affinity for dissolved phosphorus, which will serve to bind and therefore remove a portion of the dissolved phosphorus from the stormwater. <ref name=LSRCA>Lake Simcoe Region Conservation Authority. Showcasing Water Innovation: Stormwater Performance Monitoring Report. 2013. https://lsrca.on.ca/wp-content/uploads/2023/07/Stormwater-Performance-Monitoring-opt.pdf. Accessed August 2025.</ref> The sand also filters the stormwater by removing a portion of the suspended solids and total phosphorus that may be attached to those particles.<ref name=LSRCA/>
Red sand, also known as a "Minnesota filter", is iron enhanced sand designed to capture soluble [[phosphorus]] that generally passes through a typical stormwater management facility. Iron has an affinity for dissolved phosphorus, which will serve to bind and therefore remove a portion of the dissolved phosphorus from the stormwater. <ref name=LSRCA>Lake Simcoe Region Conservation Authority. Showcasing Water Innovation: Stormwater Performance Monitoring Report. 2013. https://lsrca.on.ca/wp-content/uploads/2023/07/Stormwater-Performance-Monitoring-opt.pdf. Accessed August 2025.</ref> The sand also filters the stormwater by removing a portion of the suspended solids and total phosphorus that may be attached to those particles.<ref name=LSRCA/>