Water filtering devices for water distribution installations; water filters; water filters for water pipes; regulating accessories for water pipes; water filters for water retention installations; underground water retention systems comprised of filtering devices and regulating accessories for waterflow

Non-metallic drainage systems comprised of non-metallic spherical or elliptical balls and non-metallic conduits for drainage; drainage systems of plastic materials comprised of plastic spherical or elliptical balls and plastic conduits for drainage; components of non-metallic drainage systems, namely, balls and blocks of plastic materials and not of metal; non-metallic underground drainage systems comprised of non-metallic spherical or elliptical balls and non-metallic conduits for drainage; plastic underground drainage systems comprised of plastic spherical or elliptical balls and plastic conduits for drainage; non-metallic water and liquid retention systems comprised of non-metallic spherical or elliptical balls and non-metallic conduits for water and liquid retention; Non-metal water and liquid retention systems comprised of plastic spherical or elliptical balls and plastic conduits for water and liquid retention; non-metallic underground water and liquid retention systems comprised of non-metallic spherical or elliptical balls and non-metallic conduits for water and liquid retention; underground water and liquid retention systems of plastic materials comprised of plastic spherical or elliptical balls and plastic conduits for water and liquid retention; components of non-metallic water and liquid retention systems, namely, balls and blocks of plastic materials and not of metal; water conduit installations, being a draining water device of ellipsoid or ovoid shape