I never use mouth, use a hand pump of a siphon. Remove the hose attached to the siphon (hand pump) and attach it to the filter outlet hose and start pumping (all done within the tank itself). Once water flows through, remove hand pump and attach the filter outlet hose to the rain bar. Its pretty easy. Hope I explain it well, anyway, just use any pump from whatever siphon you have, it should work. I use this method for both my eheim 2213 and 2217.
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