Patent ID: 8668092

Claim:
An apparatus for filtering water or wastewater, said apparatus comprising: (a) an underdrain for directing fluids into a filter bed; (b) a first distribution member operably associated with said underdrain through which one or more fluids pass in route to the filter bed, said first distribution member having only a single opening passing therethrough, said first distribution member having a first hydraulic characteristic, said first distribution member including identifying indicia corresponding to said first hydraulic characteristic to identify to an individual a first operating location for said first distribution member; and, (c) a second distribution member operably associated with said underdrain through which one or more fluids pass in route to the filter bed, said second distribution member having only a single opening passing therethrough, said second distribution member having a second hydraulic characteristic, said second hydraulic characteristic being different from said first hydraulic characteristic, said second distribution member having a second identifying indicia for identifying to an individual a second operating location for said second distribution member, said first identifying indicia being different from said second identifying indicia and said first operating location being different from said second operating location.