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Use the infusion site clip since you're going to be in untreated water. Be prepared for adhesion issues. I use Skin-tac for my Dexcom and Autosoft sites, and last summer after we got our pool, I started using extra overpatches beyond what Dexcom supplies. I'd add them only when I noticed the regular patch coming off. I didn't really have in-set site issues though. I'm on the T-slim, so I'd set it on a chair or something, covered up to keep it out of the sun. Not sure what to tell you with the Mobi.