Hey all     For a Water Cooled system (this is my first one by the way) do i have to replace the liquid, if so how often, and whats the best way of doing it?     Thanks very much   Nathaniel

Nope, you will never need to service it.  I would, however, replace the unit in about 5 years.

Ah ok cool, thats helpful, is this just because the water keeps going back and forth?

Ah ok cool, thats helpful, is this just because the water keeps going back and forth?

It's a self contained, maintenance free unit. Google the Corsair H50 it's just like that. It's not a full custom water loop like you may be thinking of.