+ All forms of chlorine add salt, because -OCl (free chlorine) => O2^ + -Cl (salt) . Bleach adds somewhat more, because it contains free salt, in addition to the chlorine.
+ CYA does not evaporate. It is readily biodegraded however, whenever 'slime' (algae + bacteria) layers form in the pool.
+ Heaters are one place where the SI index actually does matter. You can use the LSI calculator, here, but remember you must use the water temperature at the INSIDE SURFACE of the heat exchanger. A reasonable estimate is the heater effluent temp + 20 degrees F.
So, if your pool is 75 and the heater effluent is 85, you'd use 105 as the calculation temp. Taking your reported figures, and assuming a TDS of 500 ppm for a freshly filled pool, your POOL has an LSI of -0.26, but your HEATER would have an LSI of 0.1
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