Bioretention: Filter media

The following mix utilizes peat moss instead of compost.

• Fine Aggregate Concrete Sand (ASTM C33) (86%)
• Peat moss (12%)
• Imbrium Sorptive®MEDIA (2%)

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.

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.

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.