Isn't that the one that incorporates a Nature2 system? I'd be surprised if you HAD to keep N2 carts in it, and not just leave them out.
My opinion of Nature2 is that it is worse than a waste of money. It introduces copper and silver into your water as an algae control, which I don't want. Cartridges cost as much as a season's worth of bleach, which, of course, defeats one of the main purposes of an SWG--to stop adding chemicals to your pool and reduce your running costs.
I would stay far, far away from any shop that pushes Nature2 AND gives you no alternative on an SWG system.
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