Can WaterWetter be used with other products?

Yes it can be added on top of existing inhibitors, however doing so diminishes the total value of heat transfer benefits that WW gives you in ADDITION to other inhibitors. For best results, drain existing, refill with distilled water and add WW.

Can I use other types of water in my radiator?

No matter what inhibitor you use, you should always use a water that has mineral content removed. We always like to recommend Distilled water, however de-ionized, demineralised, purified water and even rain water is usually better than plain tap water. Of course some areas have beautiful drinking water and that may be fine.

I have a diesel 4WD - which WaterWetter do I use?

Use the pink waterwetter which has full corrosion inhibitor as well as heat transfer agent. One bottle should treat 1 radiator and is suitable for both diesel & petrol 4WD's.
The blue waterwetter although called "diesel waterwetter" is actually for heavy diesel equipment ie dozers etc.