The preferred embodiment of the invention includes a casing that encloses an extension cord system. The high rate clarifier effluent stream then flows to a membrane stage that includes a membrane media, producing a membrane reject stream and a treated effluent stream. A control unit estimates when it is appropriate to alter the coolant’s operating temperature in the cooling system and, at such times, activates the thermal device so that it warms or cools the coolant in the pilot line. There is a disc like member engageable with the opening and having each of a predetermined diameter, a predetermined thickness and a predetermined height.