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

Decayed organic material used as a plant fertilizer. Compost helps to support healthy plant growth through the slow release of nutrients and the retention of moisture in the soil.

Mineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm.

A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.