Ok, so never for a closed loop water cooler, and every 6-12 months for an open loop, unless using colors and stuff, then sooner.  Got it, thanks.  I have an open loop.  It's pretty brightly colored, but I could just get the same effect with a clear fluid and some colored LEDs.  Oh and it's way over that 6 months by now, maybe over 12.  How do I flush all that out and clean the blocks like you're talking about?
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