Thank you. I appreciate the distinction. Acronyms can be difficult for novices to any field.SWG is a bit of a misnomer. SWCG would be a bit less confusing - a Salt Water CHLORINE Generator. Using the salt in the water to generate chlorine for you rather than dumping in liquid chlorine every day. I'm new to pool ownership and just a small above ground pool at that - but wouldn't go any other way.