Unique RV Digest-it is amazing! We have been using it for over 6 ...
Unique RV Digest-it is amazing!  We have been using it for over 6 years.  We first learned about it when we had a clogged black water tank.  We were in the RV supply store in Quartzite AZ looking for some type of additive.  A women overheard us and suggested this product and said to add a full quart with some water and let it slosh around as we drove.  We drove to Parker AZ and we were able to empty the tank.  We then stocked up on the product and used it as recommended from that point.  We order it by mail directly from the company.  It arrives quickly with free shipping.  No tank odors and no tank problems.
Rating: 5 stars