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#1
11-28-2006, 02:55 AM
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I'm from calgary, and when I mix batches of water from RO/DI and tapwater, the SG's exactly the same, but the alkalinity's/pH is different. I have a calibrated refractometer, too (RO/DI calibration).
do you mean alkalinity?
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Everything I put in my tank is fully dependant on me. 
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#2
11-30-2006, 02:34 PM
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I always calibrate my using distilled water which it should read 1.000. Well I am from Edmonton, and I think the tap water in the city is around 1.002 or something like that. Checked few times about a year ago.
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