discoboy,
The 'loosest' definition is water with no salt. It ranges between distilled water and what you find in a ditch. The more 'stuff' in water, the less 'fresh' it is. As far as electric motors are conserned, 'fresh' water is nonconductive, won't short the motor. The more 'stuff' disolved in water the more conductive it is. A ~very~ broad test is, would you drink it?
- 'Doc