Started season out opening up the pool with my SWG and sand filter. SWG stopped working (have had it 3 years so can't complain). I did order a new SWG but in the meantime, switched to using chlorine with only my sand filter as kids didn't want to not be able to swim while waiting for new SWG. Now I received my new SWG, question is: do I need to re-add the salt since I was using chlorine for the last couple of weeks? Don't want to screw system up but would really like to get back to using the SWG without having to constantly add chlorine. Thanks!