You would need to do some maintenance every 6 months to a year usually. Its not difficult but its a long process
You gotta drain the loop take everything out, clean the water blocks, flush all of the old coolant out and clean the radiator then put everything back together and refill the loop which also takes a bit as you have to move the case around and get all the air bubbles out when filling.
I believe Jayztwocents has a video on water cooling maintenance
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwjWuLuw09PQAhVn0oMKHTFKDrMQtwIILDAD&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DxC-vseAhJoo&usg=AFQjCNE86T79nrKvShdgfb3eFpPABzQNGA&bvm=bv.139782543,d.amc...