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I <br /> AIR LOCK CAP WITH CHECK VALVE LIFTING TAB <br /> �I FLOAT VALVE <br /> OUTER MESH <br /> FILTER MEDI;. "' <br /> HOOD <br /> I CENTER TUBI <br /> I. <br /> SCRUBBING REGULATOR • <br /> • S <br /> 7 •• UNFILTERED WATER <br /> UNFILTERED WATER <br /> R <br /> UNDER-DRAIN MANIFOLD <br /> FILTERED WATER ^ , <br /> NAIL I FLOOR <br /> ice✓ UNDER-DRAIN MANIFOLD <br /> CAST INTO VAULT FLOOR <br /> Figure 2. The StormFilter Cartridge <br /> Cartridge Operation: <br /> As the water level in the filtration bay begins to rise, stormwater enters the StormFilter <br /> cartridge. Stormwater in the cartridge percolates horizontally through the filter media <br /> and passes into the cartridge's center tube,where the float in the cartridge is in a closed <br /> (downward)position. As the water level in the filtration bay continues to rise,more <br /> water passes through the filter media and into the cartridge's center tube. The air in the <br /> cartridge is displaced by the water and purged from beneath the filter hood through the <br /> one-way check valve located in the cap. Once water fills the center tube there is enough <br /> buoyant force on the float to open the float valve and allow the treated water to flow into <br /> the under-drain manifold. As the treated water drains, it tries to pull in air behind it. This <br /> ' causes the check valve to close, initiating a siphon that draws polluted water throughout <br /> the full surface area and volume of the filter. Thus, the entire filter cartridge is used to <br /> filter water throughout the duration of the storm, regardless of the water surface elevation <br /> in the filtration bay. This continues until the water surface elevation drops to the <br /> elevation of the scrubbing regulators. At this point,the siphon begins to break and air is <br /> quickly drawn beneath the hood through the scrubbing regulators, causing energetic <br /> bubbling between the inner surface of the hood and the outer surface of the filter. This <br /> bubbling agitates and cleans the surface of the filter, releasing accumulated sediments on <br /> the surface, flushing them from beneath the hood, and allowing them to settle to the vault <br /> floor. <br /> ' Adjustable cartridge flow rate: <br /> Inherent to the design of the StormFilter is the ability to control the individual cartridge <br /> flow rate with an orifice-control disc placed at the base of the cartridge. Depending on <br /> the treatment requirements and on the pollutant characteristics of the influent stream as <br /> CONTECH-StormFilter®GULD Maintenance Update(November 2012) P a g e 9 <br /> I <br />