Water

It's not as bad as tap water but still has stuff in it you don't want in your tank. In a pinch buy distilled.
 
I made 2 44g brutes of rodi before the cold front came in but then didnt drain the rodi setup. Went to the shop today and they were all froze and broke.
 
Should be okay, Steve. Sorry to hear that Fordracing. That's why I keep telling people to protect their RO/DI systems when we have freezing temperatures.
 
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