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I have a water softener against hard water, but all of a sudden my membrane needs to be replaced.

When you forget to refill the salts, the softener will have no effect on the hard water.

When you forget to refill the salts, the softener will have no effect on the hard water.  The sudden increase in Ph (and scale) will strongly decrease the lifetime of the membrane. Depending on the severeness of the situation, the membrane can be blocked within a matter of days/weeks