Theres a little gauge usually in your dishwasher but it took me 10yrs of having dishwashers to realise this…….you can regulate it depending on your water hardness and it takes in more or less salt depending on how hard your water is…………
The same for the rinse aid………there is a little dial you turn if take the lid of the rinse aid holder and look inside the holder………I only found that out in recent yrs. too…..
Between the 2 gauges you can regulate them to suit your water hardness and dishes come out cleaner and glasses etc. with no streaks…..