# 145 Total Dissolved Solids in Water
Colorimetric test strips. (1 test per strip)
Testing for Total Dissolved Solids (TDS) in tap water is very common and is very quick and easy with these test strips. The EPA Secondary Drinking Water Standard for for TDS is
500mg/L or ppm.
The color chart for this test allows you to read TDS in milligram/L or ppm.
The Color Comparator Chart for this test reports Total Dissolved Solids levels in water at:
0, 50, 100, 250, 500, 750 mg/L or ppm.
(Note: concentration units are milligrams per Liter or parts per million).
Results are obtained from this test in about 30 seconds.