There are several scaling problems that can result from maintaining a high, or sometimes just positive, Saturation Index.
1) Scaling of Salt Water Generator Cells. Water chemistry has to be carefully managed to avoid cell scaling which can lead to decreased performance or complete failure.
2) Scaling of Heaters. Heat exchangers coated with a lot of scale will have reduced efficiency and reduced water flow which, if excessive, can lead to a complete failure of the heater.
3) Scaling of Electric Heater Elements. Heater elements that are covered with scale can overheat due to the scale trapping heat in the element causing the element to overheat and rupture.
4) Scaling of Pool Surfaces. Surface scale is unsightly and unpleasant.