Waterbear basically said it in his first post, and with a SWCG, it necessary to add the muriatic acid as it now part of the SWCG operation. There is a thread I wrote explaining this, just do a search in the Chlorine Generators forum for "SWCG Operation". I have tried to keep it simple for the newbie SWCG pool owners.
http://www.poolforum.com/pf2/showthread.php?t=1226
Pat
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