Abstract: A submersible electrical appliance includes a housing having a water-tight function chamber and at least one water-tight junction chamber, the housing having a bulkhead wall separating the function chamber from the junction chamber, and internal water-tight compression electrical fittings passing through the bulkhead and extending beween the function chamber and the junction chamber.

Abstract: A pool filter with a housing having at least one opening for an inlet and at least one additional opening for an outlet, in which housing at least one filter pad in contact with its margins is arranged with both its sides freely accessible such that one side of the pad is connected to an inlet chamber and the other side of the pad to an outlet chamber, is configured for the purpose of easy adaptability to various filter capacity and fineness requirements and for easy handling and maintenance such that the housing includes a plurality of flatly stackable housing elements each with at least one filter pad which form terminal units and intermediate units of a pool filter set, the intermediate units being configured identical to one another and having next to the filter pad a bottom for separating the inlet chamber and outlet chamber of adjacent filter pads.