Water firmness is triggered almost completely by calcium and magnesium ions. Other di- and trivalent metals have a similar result, however normally are not present in high sufficient concentration in safe and clean waters to trigger problems. Firmness increases soap usage in laundries and triggers scale in boilers.
- Hardness increases soap consumption in laundries and causes scale in boilers
- 0 – 425 ppm
- 0 – 25 gpg
- Includes 50 Strips