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anti-caking agents (Sodium Ferrocyanide, also known as YPS or Yellow
Prussiate of Soda) that could cause discoloration of fittings and surface
finishes in pool. Do not use Calcium Chloride as a source of salt. Do not
use Rock Salt; insoluble impurities mixed with the rock salt can shorten
the life of the unit.
TIP: When adding large quantities of salt, start with an independent test
of the existing salinity level and add in portions, retesting at each stage.