Here is a great step by step for building an Auto Siphon/Bell Siphon. http://affnan-aquaponics.blogspot.co...s-of_9459.html
Home Depot doesn't have plastic bulk heads (or expanded clay tablets) by the way. They sent me to the grow store, which had both in abundance.
EDIT: I changed the link to a better siphon design, no breather tube required.





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