Quote:
Originally Posted by jason604
Oooo I will try this method since I already have air pump n mech float laying around. I'm not really afraid of overflowing since my sump can easily handle max 5 gal of water from my water jug anyways
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It does take a little tweaking to get the air pump timing right, so it doesn't run unnecessarily, so good idea to get it dialed in before you take off on vacation for more than a few days. Mine runs a few minutes almost every hour to maintain positive pressure in the carboy. The timer has 20 programs IIRC, so there are a couple hours where it doesn't run. The blank hours are during the night due to lower evaporation rate. Timings are a bit longer during the day due to higher evaporation rate. Since the air pump is fairly low pressure, there's little danger in it overpressurizing anything. Worst case if it runs too long is wasted electricity and wear/tear on the pump. Once you get it dialed in efficiently, there's rarely need to make further adjustments. I had to fabricate the bracket for my float valve out of scrap acrylic & used nylon screws/nuts to fasten things in place. It's a good idea to have an air check valve in the line between the air pump & the top off container. This helps maintain pressure & prevent leakage back through the air pump. These check valves are only a couple of $$ and readily available at most any LFS.