Low color, aromatic modified C5 hydrocarbon resins are disclosed. A grinding assembly is removably mountable on the container and has one or more manually operable latches engageable with keeper structure on the collar to releasably hold the grinding assembly in place, while permitting rotation of the outer portion of the grinding assembly relative to the container, which outer portion is covered with an elastomeric material for improved grip. The underwater accommodation has a pressure shell, in the lower part of which a first ballast tank is located; the above water accommodation has a structure, in the lower part of which a second ballast tank is attached. A second air supply is arranged on the other side of the nozzle. The rate information comprises several fields indicative of the index, the number of spatial streams, and bandwidth.