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#3
August 20th 06, 07:40 PM
posted to rec.aquaria.marine.reefs
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Dupla ph control HELP!
"Arjan Bakker" wrote in message ...
but when I try calibrating with PH4 I cannot get the PH control below PH5. Why would you calibrate pH meter with 4 for a reef? You calibrate with buffers the way measurement is BETWEEN them. For reef tank pH 8.2 you use buffers 7 and 9 or 7 and 10. Buffer 4 is for freshwater tanks where you keep the water at below ph 7 for some fish... 
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