water recirculation systems comprising water pumps, low head oxygenator, degassing columns, rotary drum micro screen filters, swirl separators, fibre glass rearing tanks, fibre glass head tanks, concrete water collection reservoirs, protein skimmers, secondary water pumps, water level control standpipes, boiler for hot water heating, R22 refrigeration equipment, titanium plate-frame temperature recovery and trim exchangers, titanium shell and tube evaporators, regenerative and lobe air blower equipment, pure oxygen supply and programmable monitoring/control/alarm instruments; waste water treatment systems comprising water pumps, rotary drum micro screen filters, rotary drum vee wire screen filters, rotary incline belt micro screen filters, parabolic vee wire sieve screens, and automatically controlled calcium hypo chlorite batch effluent disinfection equipment; and, water filtration equipment, namely, rotary drum micro screen filters, rotary drum vee wire screen filters, in-line vee wire filters, rotary incline belt micro screen filters and parabolic vee wire sieve screens