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The brass would be more likely to dissolve & leach metals in tap or purified water than in an alkaline kalk solution. IMO, the low pH caused by absorption of CO2 into an unbuffered water stream would be the thing to avoid.
Mine has been working great for > 2 years, except that I did need to replace the solenoid once because of Ca ppt build-up causing a steady drip through it.
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Mike
I'm also Aquatect's dad and 3_high_low's brother
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