Difference between revisions of "Bioretention: Filter media"
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<p>Biomedia should be obtained premixed from a vendor. </p> | <p>Biomedia should be obtained premixed from a vendor and meet all municipal, provincial and federal environmental standards. Mixing of sand, topsoil and compost should be done in a manner that preserves topsoil peds. The mixture should be free of stones, stumps, roots, or other debris larger than 50 mm diameter. Samples of the filter media should be dried, ground and tested to ensure they meet the following specifications:</p> | ||
The following mix utilizes peat moss instead of compost. | The following mix utilizes peat moss instead of compost. |
Revision as of 14:23, 11 July 2017
Biomedia should be obtained premixed from a vendor and meet all municipal, provincial and federal environmental standards. Mixing of sand, topsoil and compost should be done in a manner that preserves topsoil peds. The mixture should be free of stones, stumps, roots, or other debris larger than 50 mm diameter. Samples of the filter media should be dried, ground and tested to ensure they meet the following specifications:
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