It is 100 coliform cells for 100 ml water.
1. Coliform cells. 2.Total bacteria count
5 ppm
10 pc/L
1000 pc/L
3 pc/L
4.0-6.0 ppm
500 ppm
It is the permissible limits for water quality laid down as standards by United States Public Health Drinking Water Standards.
< 0.05
0.001
1. Gross Beta 2.Radium -226 3.Strontium -90
< any thing that is a liquidation so it can leak through if it's solid then it can't be filtered