0.o15 ppm
0.1
60 -100 ppm is the currently acceptable hardness level for drinking water in US and Canada.60 -100 ppm is the currently acceptable hardness level for drinking water.
4.0-6.0 ppm
500 ppm
5 ppm
Between 50 ppm and 300 ppm is safe. Better below 100 ppm.
5 ppm
it should be below 3.5 ppm
The maximum acceptable level of contaminants in drinking water is typically set at 0.01 parts per million (ppm). This means that water with 0 ppm of contaminants is considered to be of the highest quality, as it contains no harmful substances that could potentially impact human health.
A good parts per million (ppm) level for water quality is typically below 500 ppm. This level ensures that the water is safe for drinking and other uses.
The recommended safe level of TDS (total dissolved solids) in drinking water is below 500 parts per million (ppm).
It depends what substance there are 10 parts per million of.