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This is the only unit I would ever recommend anyone use to connect their RO system directly to their tank. It is the only unit to incorporate redundant safety measures and make absolutely certain your tank is safe from failure. Level-Loc was designed and built by reef aquarists. The goal was to make an auto top off that was easy to install, flexible and most of all, dependable. The Bracket
The PVC bracket allows you the ability to mount the unit on the side of almost any glass aquarium sump or plastic storage tub. Two nylon thumb screws secure the bracket to the sump wall. A large 1 7/8" suction cup on the inside of the sump, further stabilizes the unit. The float is mounted on a sliding tube that allows you to raise or lower the float to the desired water level. The tube is secured in place by a short nylon thumb screw.
Shown here, is a Level-Loc mounted on a 75 gallon aquarium. The riser tube is raised to the uppermost position. The bracket can accommodate rims up to 1.5" wide.
The Float Valve The float valve controls the flow of water into the sump. It is made of polypropylene with a stainless steel locking bolt and wing nut. We ship an optional nylon bolt and nut with each unit in case you are uncomfortable using stainless steel in your aquarium. I prefer the stainless steel since it is stronger and doesn't noticeably corrode in contact with saltwater. Either option works just fine. The float can be swiveled to point in different directions to allow for obstructions in your sump. By loosening the wing nut, the float can be adjusted up or down depending on your needs. The water line connects to the float with a compression nut. The unit comes fully assembled out of the box. The Soilenoid and Float Switch The purpose of the solenoid and float switch combination is to provide safety backup to the float valve. In the event of a float valve failure (mechanical, stray power cord, snail, etc.) the float switch will sense the rising water and the solenoid will close. In the picture above, you can see the float switch is mounted just slightly above the float valve. Having a solenoid also gives you the added option of plugging it into a timer so that the water is only on when the timer turns on the solenoid. This gives you an added layer of safety and allows your RO/DI unit to run less frequently and generate more water at one time, extending the life of the RO membrane.
The solenoid is 12V DC which makes it safe around water and energy efficient. It is constructed from polypropylene and stainless steel so no corrosive materials come in contact with the fresh water. The wire connectors on the solenoid are completely insulated with heat-shrink connectors to ensure that the terminals do not corrode. The wiring connections to the float switch are inside the riser tube which is sealed with 100% aquarium safe silicone  |
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