I think it's mostly market share, from what I've seen here in Edmonton, it's like 80% ecotech and 20% tunze, so of course you see more ecotechs for sale, I agree they hum but it's never been much of an issue unless the owner didn't know how to set the spacing properly and prematurely wore out the magnets.... Come to the store if you wanna see what I mean.... Lol anyone that has been in knows what I'm talking about lol.....
Steve
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