Another option would be to add a little salt to your makeup water everyday. That way the salinity will slowly rise.

thanks for all the help and i have a 50g tank with a 20g sump and i just want to get my tank back to were it was with out hurting anything and am geting rid of the hydrometer and geting a Refractometer does anyone no what one i should get what are some good ones thanks

JL Aquatics has a good temperature compensated vertex model for $49.95.