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Basic Function the entire filter cartridge is used to filter The StormFilter is designed to siphon water throughout the duration of the storm, stormwater runoff through a filter cartridge regardless of the water surface elevation in containing media. A variety of filter media is the unit. This siphon continues until the available and can be customized for each water surface elevation drops to the site to target and remove the desired levels elevation of the hood's scrubbing of sediments, dissolved phosphorus, regulators. dissolved metals, organics, and oil and The cartridges are connected to the under- grease. In many cases, a combination of drain manifold with a plastic connector. media is recommended to maximize the Since some media used is potentially effectiveness of the stormwater pollutant buoyant, a threaded connector affixed to the removal. under-drain manifold (with glue or other adhesive) is necessary to ensure that the cartridge isn't lifted out of place. For the ; - heavier compost media, a slip connector is �' t w .3 used. I l s = 1 The StormFilter is also equipped with flow III '''fir` spreaders that trap floating debris and . surface films, even during overflow 0 i, i * re conditions. Depending on individual site �h. characteristics, some systems are equipped with high and/or base flow bypasses. High r, C'.. flow bypasses are installed when the calculated peak storm event generates a flow that overcomes the overflow capacity of Figure 1. The StormFilter Cartridge the system. This is especially important for precast systems. Base flow bypasses are sometimes installed to bypass continuous Priming System Function inflows caused by ground water seepage, When stormwater in the StormFilter unit which usually do not require treatment. All enters a StormFilter cartridge, it percolates StormFilter units are designed with an horizontally through the cartridge's filter overflow. The overflow operates when the media and collects in the center tube of the inflow rate is greater than the treatment cartridge, where the float in the cartridge is capacity of the filter cartridges. in a closed (downward) position. Water continues to pass through the filter media and into the cartridge's center tube. The air in the cartridge is displaced by the water and purged from beneath the filter hood through the one-way check valve located in the cap. Once the center tube is filled with water (approximately 18 inches deep), there is enough buoyant force on the float to open the float valve and allow the treated water in the center tube to flow into the under-drain manifold. This causes the check valve to close, initiating a siphon that draws polluted water throughout the full surface area and volume of the filter. Thus, ©2006 CONTECH Stormwater Solutions Toll-free:800.548.4667 2 of 9 contechstormwater.com Vault,CIP and Linear StormFilter Operation and Maintenance Guidelines