(under subclass 251) Apparatus which includes (1) a reaction driven distributor disclosed as cooperating with a sludge settling area or large filtering plant, or (2) a means to seal the apparatus against the loss or leakage of fluid, said means consisting of a receptacle to hold a heavy liquid in a location where it will block the path of egress of said fluid.
(1) Note. The filter bed type distributors are usually large and heavy and may involve problems of structural bracing.
