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ESI - Model MBPP -Absorbent Socks
Our standard medium for passive stormwater filtration, ESI MBPP, is a proprietary polymer manufactured to ESI specifications. It is manufactured by techniques which produce a very large surface-to-volume ratio. The filtered particle rating is 5 microns, but the product is loaded into ESI filters in a way that produces high flow rates (58 gallons/minute/square foot at 1-foot head pressure). ESI MBPP is our most economical filter medium and is well suited for high traffic urban sectors. ESI MBPP not only removes oil and grease, but the associated heavy metals, fine sediments and organic particles plus the nutrients bound with them.
Independent certified NELAP environmental laboratory testing was performed to evaluate the efficiency of ESI MBPP for stormwater filtration. The tests included EPA 410.4 COD (Chemical Oxygen Demand) and an EPA 8015 Mod. (Total Petroleum Hydrocarbons by GC).
A liquid mixture of inorganic solids, various hydrocarbons (including numerous common fuels, kerosene, as well as mineral spirits and motor oils) were included in this mixture to represent typical contaminants of urban/industrial stormwater. The solution was diluted into 12 gallons of unfiltered tap water.
The mixture was then poured over a #3.5MBPP standard ESI surface/storm water filter, completely passed through the filter in 7 seconds and was collected for testing. The results were as follows:
- EPA 410.4 COD*: 98% of inorganic solids were recovered
- EPA 8015 MOD*. “Total Petroleum Hydrocarbons” test:
ESI Filter removed the tested hydrocarbons at or below the available detection limit of 250 mcg/L