A so-called OpenChannel conference is established by separating particular participants of the conference from those participants that are actually currently active in the conference. The water-on-water valves are regulated by the pressure in a product line, which contains fluid from a product line of the filter module andor the product side of a water-on-water storage tank. The first coil-end lead of the first horizontal deflection coil and the second coil-end lead of the second horizontal deflection coil are wound around the second bobbin to form a balance coil such that the balance coil is formed continuous with horizontal deflection coils. The undercover apparatus can be a locked into any selected position within these ranges of motion controlled by the control head, or additional positions controlled by operation of the excavator boom and used in that position.