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refractometers don't use electricity and if you treat them right don't wear out, as a rule---42.00 could do it.
Sincerely, either go to a walmart and buy water from the ro kiosk, or get your own ro/di. Not using it just means an endless algae battle and the possibility of evaporation concentrating lethal metals in your tank.
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Sk8r
"Make haste slowly." ---Augustus.
"If anything CAN go wrong, it will, and at the worst possible moment."---St. Murphy.
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