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I noticed recently that there are alot of manufacturers that have incorporated the SPA FROG into their plumbing system. It seems to be a no-brainer when all you do is replace cartridges on a monthly basis for the bromine and every 4 months for the mineral cartridge.Convenience is the name of the game here.
My only complaint is the fact that you can't see when your out of bromine other than when your levels start to drop in water testing. I was on the phone with them yesterday and they are going to at least start putting replacement cycle on the bottle so that you will know when to change it. Chances are if you go through your bromine in 3 weeks to start you will stay in the 3 to 4 week cycle and need to have a new cartridge on hand...
At the Atlantic City Pool/Spa show, there were a few other manufacturers which are currently comtemplating adding the Frog to their program. I don't recall which manufacturers specifically, but the word is out there that the Frog is doing a fine job for the dealers that sell it. They may want in.