11 Apparatus for water supply and sanitary purposes; installations, equipment and apparatus for water, waste water, sewage, sludge, solid waste, rubbish, municipal waste and industrial waste engineering; installations, equipment and apparatus for the treatment of water, waste water, sewage, sludge, solid waste, rubbish, municipal waste and industrial waste; water, waste water, sewage, sludge, solid waste, rubbish, municipal waste and industrial waste treatment plants; installations, equipment and apparatus for the purification of water, waste water, sewage and sludge; water, waste water, sewage and sludge purification plants; installations, equipment and apparatus for the filtering of water, waste water, sewage, sludge, solid waste, rubbish, municipal waste and industrial waste; water, waste water, sewage, sludge, solid waste, rubbish, municipal waste and industrial waste filtering plants; parts and fittings for all the aforesaid goods