How well does the SCWD hold up to hard water and heavy concentrations of calcium?
As mentioned SCWD has been field-tested for over 53000 hours of continuous use in a sustained reef environment where water conditions were at or above calcium levels of 400ppm. In addition, SCWD has been subjected to qualification testing, which included use of hard water and elevated calcium levels (1000ppm) that were sustained for six weeks. After one month the power head running the SCWD stopped working, and required cleaning. Two weeks later the same power head failed again, but SCWD continued to operate without incident.
