I do but I'm tired of worrying about always having red coolant on hand or else the mix is thrown off. Will the coolant filter keep the mix correct even though I for instance run low on coolant and put water in it if I don't have the proper stuff on hand. That is the question that I want answered the most.
In short, no.
The longer version is, the filter doesn't self-regulate...it isn't able to detect how much SCA's present and either release SCA into the coolant or not, depending on what's needed. It's constantly releasing a certain amount of SCA, regardless of how much or how little is already in the system.
Furthermore, having too much SCA can be as bad as not having enough...it will protect the engine from cavitation even better, but it'll also start acting like Bar's Stop-Leak and start plugging passageways (such as radiator tubes) and/or start coating to much around the cylinder walls, resulting in less heat being transferred from the cylinder to the cooling system i.e. an engine that's "running at operating temperature" but is actually overheating.
If you're running red truck stop coolant (i.e. ELC), I would suggest sticking with it, keeping a couple of extra gallons onhand, and running a Napa 4070 SCA-free coolant filter.
Hope this helps some...good luck
