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Mike,
Naturally there is a a whole range of different water chemistries here but Like I said, 10dh is about average. Myself I have water of about 8dh and a Kh of between 4 and 5. Ivar's may indeed be softer. I would be very interested to know where he lives. Too bad he didn't complete his profile. I believe mains water here in the Hague is about 290 TDS.
B.Scott
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