A young scientist demonstrating water hardness test with a thumbs up
A scientist holding two test tubes, the result of water hardness test, one good and one bad result
A man performing the water hardness test - the water is soft and good for use
A man performing the water hardness test - the water is soft and good for use
A scientist in a lab putting some chemicals into a test tube due to test the hardness of the water
A scientist is not satisfied with the water hardness test-the water is hard...
A scientist in a lab putting some chemicals into an erlenmeyers flask due to test the hardness of the water - the water is soft and the content becomes blue
A scientist holding an erlenmeyers flask and puts some chemicals into it to test the water hardness
A man checking the hardness of the water in an erlenmeyers flask-the water is soft due to the blue color
Time-lapse of a man checking the hardness of the water
Scientist stirring purple water in a test tube. Researching and experimenting.
medical scientist showing pink test tube to the camera wearing protection suit