Bioretention: Filter media
The following mix utilizes peat moss instead of compost.
Sand (86%) Peat moss (12%) Imbrium Sorptive®MEDIA (2%) This mix aims to maximize phosphorus removal in 2 ways:
• ASTM C33 (Fine Aggregate Concrete Sand)
substituting peat moss for compost, since peat moss has lower phosphorus content than compost and does not leach phosphorus; and including Sorptive®MEDIA to sorb phosphorus and minimize phosphorus in effluent