[Johnb]

Hi, what is recommended for mixing with coolant, tap, distilled or deionized.
My manual says only to mix with tap water but our water is very hard.

Cheers.

 

[Johnb]

Yeah I already brought coolant concentrate and a few bottles of deionized water, but reading through the manual it states use only tap water... but I opted for the deionized.
Read a lot of posts about deionized water reacting with the metals in the coolant system....
I'll use pre mix next time, Got to be easier.