I haven't changed the tubing, it's norprene and considering the pumps are used for less than 20 minutes a day I figure I have a considerable period of time before I need to even concern myself with it. I have several feet of the tubing on hand should it become an issue. Considering I use EI dosing, some error is fine anyway. It's a valid point, but at 3rpm there isn't exactly a lot of wear and tear either.
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