I guess maybe some are against SWCG's for AG pools, but I'm not, and I don't think the mods are. We do try to inform people of risks, just like I do every time I tell people to use muriatic acid.
Bottom line: any SWCG with sufficient capacity for your pool's volume and bather load is fine. There's nothing intrinsic to a salt generator that says this one must be for AG pools and that one for IG pools. In fact, a SWCG for an 17,000 gallon AG pool probably ought be a bit higher in capacity than for an IG pool, because AG pools tend to get used more, where IG pools are often more ornamental.
My own experience with SWCGs is limited, but I've used Pentair IC units sucessfully. If I were running your pool, and it was heavily used, I'd get an IC-40. If it's only very lightly used, I'd get an IC-20. But that's just because that's what's familiar to me, and has worked for me.
Ben
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