Patent ID: 7455782

Claim:
A grit removal system for a hollow, completely enclosed emergency water reservoir tank having a bottom portion and maintained under elevated pressure above ambient atmospheric pressure and having a tank inlet from a municipal water supply system and a tank outlet to a local water distribution line comprising: a suction intake located in said bottom portion of said enclosed tank, a suction line coupled between said suction intake and said tank outlet, a particle filtration unit located externally of said tank, a filtration unit inlet conduit leading from said tank outlet to said particle filtration unit, a filtration unit outlet conduit leading from said filtration unit to said local water distribution line, whereby said elevated pressure within said tank causes said suction intake to suck in water with entrained grit from within said tank and force said water and grit into said filtration unit from said filtration unit inlet conduit and expel water from said filtration unit to said local water distribution line.