Abstract: An improved method for aeration of septic tanks and the like by drawing atmospheric air into an expansion chamber and from there into agitated sludge to provide low pressure small microbubbles which have long hold times in the sludge material.

Abstract: An improved method for aeration of septic tanks and the like by drawing atmospheric air into an expansion chamber and from there into agitated sludge to provide low pressure small microbubbles which have long hold times in the sludge material.

Abstract: An improved aeration device for septic tanks which allows fine bubbles of air to aerate waste material in the tank so that aerobic bacteria may fully perform their decomposing function. Air enters the upper end of a shaft and exists adjacent a propeller. The propeller is protected from interfering with its bubble formation action by a guard bushing concentrically positioned in the air tube so that typical non-organic waste adulterants such is plastic and rubber materials, that are often found in septic tanks, are not drawn into the propeller to interfere with its action.

Abstract: A textile cleaning apparatus comprising a track adapted to extend along a row of textile machines, a carrier movable along the track, and means for driving the carrier along the track. The carrier includes blower means for directing a stream of air outwardly, conduit means associated with said blower means for directing at least one stream of air onto the textile machines as the carrier moves along the track, and air intake means associated with the blower means. The air intake means includes a chamber and a conduit communicating with the chamber and extending generally vertically alongside a row of machines. The conduit has an outer wall and a tubular filter within the conduit with means associated with the lower end of the filter for closing the space between the filter and conduit such that air drawn upwardly passes along the inner periphery of the filter. Valve means is associated with the filter to normally close the upper end of the filter.