Abstract: An apparatus for maintaining potable water stored in a tank. The apparatus is automated and self-contained. When fluidly connected to a water storage tank, the apparatus causes continuous circulation of the potable water to prevent contamination resulting from stagnation and stratification. The apparatus also monitors the amount of free chlorine in the potable water, the pH level, and the amount of total dissolved solids (“TDS”). If the potable water contains less than a predetermined amount of free chlorine or if the pH level is less than a predetermined level, the apparatus automatically adds a selective amount of chlorine and/or minerals to the potable water. The apparatus will also filter the potable water to remove suspended solids.

Abstract: An apparatus that combines desalination and pressure washing. The apparatus includes separate inlets for seawater and for freshwater. The apparatus includes a first diverter valve to selectively permit the flow of seawater or freshwater into the apparatus. The apparatus also contains a second diverter valve for directing the flow of seawater or freshwater to a pressure-washer outlet for pressure washing or directing the flow of seawater to a desalination assembly such as a reverse-osmosis (RO) membrane for desalination. The apparatus contains one or more pumps sufficient to generate fluid pressure for pressure washing and generating a driving pressure across the desalination assembly. A variable frequency drive system may be included in the apparatus to regulate the RO pump flow rate across a fixed orifice thereby regulating driving pressure and in turn the freshwater production rate from the RO system.