Originally Posted by Shu
You premix your water and lets say fill your sump up to the half point mark (by pouring buckets, gallon jugs, etc of premade water directly into the sump). At this point your return pump in your sump is off. Then, up on your tank, get your overflow box setup and in place. Then, start the siphon and get the water flowing from the tank down to the sump. Once that has started, then turn on the return pump in your sump to pump the water back to your main tank. Let it run for a while, make sure everything is running smoothly. Then, create a mark with a grease pencil or marker, etc as to where the waterline on the sump is.
At that point, turn OFF the return pump and let the overflow continue to drain water into your sump until it stops. You do this to test to see if you will flood your sump whenever you loose power. During this point of the testing, be really close so you can plug in your return pump quickly if you notice your sump getting close to flowing over. IF that happens, remove some of the water from the sump and try again.
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