These things should be taken off the market. I had been using them for a slow drain (which kept getting worse) until it stopped up completely. A plumber's bill later to snake the drain, I now have a free-flowing drain and a jumble of softened, twisted Sani Sticks that never dissolved. My guess is they are meant to give off the pleasant odor for a few days to make you think they work, then soften and make their way down the drain to make you think they have dissolved.
Save your money as these are worse than useless and will cost you more than doing nothing as they will clog your drain and force you to clean your drain earlier.
Bottom Line: No, I would not recommend this to a friend
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