We've kept maintenance simple.

The SiltPrison treatment system does not require any special equipment outside the industry standard vactor trucks! Click the button below to learn more about the ease of maintenance!
Product Maintenance
Optimized Catch Basins for Verified Stormwater Treatment.

SiltPrison systems are a new take on existing precast stormwater collection structures. Our unique catch basin risers are manufactured with inverted cone filtration membranes which actually encapsulate stormwater for pressurized removal of fine sediment and phosphorus.
Seeking Solutions?

The SiltPrison is a stormwater quality unit that provides new solutions to the evolving needs and regulations in civil site design.
Product Information

Schedule a Lunch and Learn: By seeking out Specifiers, Peer Reviewers, and Town Engineers alike we hope to join the conversation of effective modes of stormwater treatment.

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Verification Testing

The SiltPrison has undergone testing and review at Alden Laboratories and by the Massachusetts BMP Clearinghouse, MASTEP. The SiltPrison’s treatment mechanism of filtration and settling were evaluated and tested at Alden for three different performance characteristics: re-entrainment, hydraulic characteristics, and sediment removal efficiency. Among the findings were a 62% sediment removal rating and impressive performance of the SiltPrison to prevent re-entrainment and washout.

The mission of the MASTEP program was to provide technology transfer information about innovative stormwater Best Management Practices to MADEP, conservation commissions, local officials, and other BMP users to help them make appropriate technology implementation decisions. In essence, they evaluate the quality of a stormwater product’s performance claims based on supporting information and testing data. The SiltPrison was rated 2 on their 1-4 Scale stating “sound laboratory studies exist for this product”. The SiltPrison was the last stormwater treatment technology reviewed by MASTEP, and the only unit ever to be categorized as an Advanced Inlet Device, ushering in a new generation of stormwater treatment technique, which is currently unmatched. The SBZ SiltPrison profile by MASTEP can be found here.

Product Acceptance

Subsequently hundreds of SiltPrison units have been specified and installed in the New England states of Maine, Massachusetts, and New Hampshire, states with some of the most developed requirements and stringent review in the country. These projects include private and public projects, projects with federal funding, projects where SiltPrison units were added by peer review, projects with superseding orders of conditions, projects that would require the city or state to maintain the SiltPrison units, projects protecting drinking water, and other projects where a high degree of confidence has been placed in SiltPrison stormwater treatment.

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