The 82mm sewage tube i use cling wrap plastic to seal one end making the bell, i could not find an end cap for it. i did a quick comparison test on the revised siphon. Bell auto-siphon for aquaponic systems r380.00. a bell auto-siphon is the heart of an aquaponics system, though it can also be used in an hydroponic setup.. I've been fascinated by hydroponics for years. when it finally came time to play around with one, i found out about aquaponics - a sort of symbiotic relationship....
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