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I have the same one, came dry. works fine and i do 3 pt calibrations every 5th use or so and it has never been more than 0.1 pH off so far.
you can still use a carbon filter, you do not need to duct it outside. the carbon filters work by actually adsorbing the molecules that cause...
Kill the surface mold with bleach or something, then paint the walls to seal any mold in. You should be good to go after that
I would seal (paint) the concrete then
Google search... http://blackmold.awardspace.com/kill-remove-mold.html
So aside from the d!(k contest... How would someone prep appropriate water? If you pH adjust your RO water, them what should you use to up the...