Unless you're running a passive water cooling system with just pump, but no fan(s), most water cooling setups still rely on at least one fan to move air through the radiator. A single 120mm fan is easier to maintain than multiple smaller fans, of course, and generally moves more air at lower noise levels and produces lower frequency signature noise (as I said, generally speaking).
The important thing to realize is that most liquid cooling systems need periodical maintenance; the period depends on the system, as well as the type of maintenance. I have seen users go 24 months without doing anything, and I've seen users that, every six months, have to drain the system out, flush it with a powerful mix of Pinesol/Lysol, and then refill the system. Most people have to at least drain the system every 12 months and then fill up with fresh coolant.
There are many variables that come into the equation, so it's not so simple as just saying, right from the get-go, that, "you only need to this and this every this many months," without actually building and running the system for yourself.
Contributing Writer, SPCR
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