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[QUOTE="GBBUDD, post: 530407, member: 10026"]
theres three basic types of air pumps the diaphragm and the piston , the piston being much stronger and longer lasting hands down.   the third is newer and i do not know about its reliability but it is not for koi toilets . this is a medical device that will actual get the oxygen levels in our water higher that the water can normally handle. now here's the difference the bubbles are almost non existent.  you can see your fish completely next to no surface agitation and how do i know this. one of mu supplies that i have ben spending a lot of time at recently just added one and i will tell you what . cheap bubble machines watch out. i get a video of a pond with both running separately. 
i get it i started with a 120 way more than i needed  stepped down to an 80 and it too is more than enough for a 12 bladder down 6 feet.  i do use the 80 to pump air in the winter to both keep the opening in the ice in the pond and a air pipe dumpping into the snorkel for the winter to keep the water from going stagnant
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