Originally Posted by fender
How much do you evap a day? Do you have fuge/sump?
Place and secure a full freshwater container upside down (water cooler tank works good) with the mouth opening sitting at your minimum level for water. When the water drops below the level the container will burb and flow water up above the line. Same way a water cooler works. Usually no one has the room for this and you can only top off so much with this method but it is completely automatic and idiot proof.
If you have an RO setup you can usually add a float valve fairly cheap and easy.
FENDER, sounds like a good idea, but i want somthing, NOT HOME MADE, something off the market, reliable, dummy proof! I get about 1/4 gallon a day under 130w pc's