초록 ▼

An improved method for constructing filter underdrain systems may be provided which uses prefabricated underdrain cells. The prefabricated underdrain cells may have a one piece construction having side walls and a bottom. The side walls may include a porous plate support ledge with a ridge at the ce

An improved method for constructing filter underdrain systems may be provided which uses prefabricated underdrain cells. The prefabricated underdrain cells may have a one piece construction having side walls and a bottom. The side walls may include a porous plate support ledge with a ridge at the center of the ledge. The ridge helps ensure that the sealant forms a uniform and effective gasket when the porous plates are installed.

대표청구항 ▼

[ We claim:] [1.] A method for constructing a filter underdrain comprising the steps of:installing at least one angle stop to a filter slab of a filter tank;providing a modular plenum assembly, which extends substantially the entire length of the filter tank, having a bottom, side walls, and a top o

[ We claim:] [1.] A method for constructing a filter underdrain comprising the steps of:installing at least one angle stop to a filter slab of a filter tank;providing a modular plenum assembly, which extends substantially the entire length of the filter tank, having a bottom, side walls, and a top opening with a porous plate covering said top opening; andinstalling said modular plenum assembly against said at least one angle stop.