Digital Water purity tester.. this is cool!!

TDS is not a good indicator of how "clean " the water is. TDS is total dissoved solids, if those solids are sodium, chloride and other mineral thats OK but if those solids are mercury and lead...not so good. In addition it wont measure any bacterial contamination. Some of the water in the "steams" in the Florida parishes measure 250 TDS, but I wouldnt drink it.

TDS is good for telling you if its hard water or soft and thats it. Of course 0 TDS is deionized or distilled water which could still have bacteria. Bottom line....dont use this to go test pond water for drinking..