do i need to change the fluid in my 295x2 radiator?

No you never put normal tap water in a water cooling loop.

You use distilled water Slayer.

Using normal tab water will clog the radiator and pipe work of the cooling loop due to the additives that are put in tap water such as fluoride, and tap water depending on what area you live in, or your location can contain high calcium levels.

That will fur up the pipe work also.

You need to use distilled water with a solution in the mix to prevent algae buildup also.
 


is it necessary to change it ? and what is this liquid called?