@ketos
residual chlorine test
https://ketos.co/parameter/res....idual-chlorine-water
arsenic testing in water
https://ketos.co/parameter/ars....enic-water-quality-t
Total Dissolved Solids Test levels may be signs of contamination or excessive minerals, and low levels often suggest cleaner, fresher water.
https://ketos.co/parameter/tot....al-dissolved-solids-