Change Rainsoft Salinity level

The manual doesn't mention that. Last year the technitian changed the level from 14 to 8, so you can barely feel "soft" water.
Somebody knows how to change it?
I have the Apollo Gold series with the computer. It has 4 buttons, one for the limited setting (Salt level, clock and regeneration time), up and down arrow, and the regenerate button.
Thx
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Anyone?
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