Raritan only markets CP as a bowl cleaner...but it's actually the best sump and sink drain cleaner on the planet and requires -0- manual labor to use. I posted instructions in a recent thread (maybe earlier in this one). I can post 'em again if necessary.
As for CP vs. vinegar...they do different things. A weekly cupful--no more than 2--of distilled white vinegar (available from any supermarket) flushed all the way to the tank can prevent mineral buildup in the hoses. It CAN remove buildup, but it's too labor intensive to be worth the effort because it has to be replaced hourly (what all the people who claim vinegar won't work overlook), making muriatic acid a much easier choice. CP can't do that.
--Peggie