As I contemplate a re-do of my pumping station, I notice that a significant number of pool owners have SWG's in their stations. Since this apparatus supplies the ionic chlorine to the system, I assume these owners do not use the BBB system ( or at least the bleach part of it ). My question therefore is, what other chemicals do SWG owners add to their pools on a regular basis; how often, and in what quantities? I would presume the main reasons for "having" (or installing) such an expensive device, would be either a significant savings in the cost of chemicals, or a giant advantage in convenience, as regards the overall time saved in pool-testing & the purchasing and applying adjunct pool chemicals. All thoughts on this question are appreciated.