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→Chemical control
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===Chemical control===
===Chemical control===
−For infiltration practices an 'amendment' or chemically reactive 'additive' can help to retain even more phosphorus.
+For infiltration practices an 'amendment' or chemically reactive 'additive' can help to retain even more phosphorus. Typically these components would make up 5 to 10% by volume of the filter media mixture.
{{:Additives}}
{{:Additives}}