Automatic Top Off & Water Fillers Automatic top off devices detects dropping water levels to replenish evaporated water - important for saltwater systems, where salinity increases when water evaporates, and for sumps or refugium reservoirs which must stay at a certain level to maintain proper flow to the main tank. Automatic shut-off kits allow you to fill your tank unattended, usually intended for use with an RO or RO/DI system.
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