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#1
11-19-2007, 03:57 AM
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No kidding! Should be a matter of just testing the pH probably .. if the pH never dips below 11 it's probably just hunky-dory to do it that way.
I've never really noticed calcification inside the pump though on my reactor. But what I do notice is a buildup at the effluent line where it reacts a little with air. Having said that though, I've always felt that the kalk powder is hard on the pump. In my case I just use a MJ600 so I'm not out a lot of capital to replace it every couple of years but still, your reasoning makes me want to rethink my setup a little nonetheless. 7 seconds is awesome. It's hard to find a timer that lets you do less than 1 minute intervals. Chaulk up another advantage to using an aquarium controller...
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee! 
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#2
11-19-2007, 04:00 AM
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I have a MJ1200, and while I have yet to see any wear on the tank, its an easy, albeit wasteful replacement.
My control will do seconds, but only in 10 second intervals. Still might be worth the change if I can save a pump, and still get the same results. I also get build up in my top-off line, and sometimes if I stop the top off it takes a bit longer to get the flow going again.
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