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Ryane,I built a sealed box with scrap acrylic
And 2 bulkheads a top and bottom
Installed valves on both
The lower port is piped 1/2" below the water level in my return reservoir
Close the bottom valve and fill the tank thru the top valve
Then close the top valve and open the lower valve
When you loose water from evaporation the water level will drop below pvc pipe allowing air in and water out. Replacing your lost water. once the water level rises the air can no longer enter and the vacuum seal is regained stopping the water flow.