I tryed the Calgon once and it worked ok but seemed to me to take a long time to mix and do three tanks, After I read some posts on the product Pure Power which they had great comments I have been using it and almost one bottle and has worked great cleaned the sencers and no smell a little pricie about $19. only use 2oz. but so is calgon. I think its what ever you like, there are several that work.
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