Though a salt meter avoids having to purchase reagents, the fact is that the salt level does not change very much in a pool, especially one that uses an SWCG system. The salt, CH, and CYA levels tend to be quite stable, at least over periods of months over the summer, so you don't really purchase reagents very often for these tests (you mostly puchase reagent for CYA since you use a LOT, 7ml, of reagent for each test). Only significant backwashing and splash-out can lead to some dilution. Adding acid will increase chloride (salt) levels and many SWCG users find that their pH rises so that they frequently are adding acid, but this is a cup of acid only adds a couple of ppm of salt in a typical pool.
Richard
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