How long are SWG cells supposed to last? I'm thinking of installing a chlorine generator system, but the replacement cost of the cell is a concern. The cell costs almost as much as a whole system (I realize it is the most important part). If it will need replaced in under six years, I don't think the economics make sense (although the convenience has to be factored in, of course). I guess a related question is how widely available will replacement cells be for any given brand and model of SWG in several years?