Abstract: Apparatus for aerating and/or treating shallow ponds of water includes a submersible pump having an outlet conduit extending to a support means above water level. At the support means, the outlet conduit extends downwardly and communicates with one or more distributing conduits having a greater flow capacity. Valve means is provided at said support means for introducing air and/or chemicals into the downwardly flowing stream. The distribution conduits terminate in a submersible distributor head. The entire apparatus is portable.