Pros: Effective, eco-friendly, biodegradable, long-lasting, smells good
Cons: A little work to put it in the tank
Wow, these things smell great with a nice and intese mint smell right out of the package (which is better than other bathroom smells!). You place the Bio Pac automatic bowl cleaner tablet in your toilet tank and then when you flush, blue-colored water with detergent in it fills the bowl. As long as the water is blue, the tablet is still working and is cleaning the sides of your toilet bowl.
I decided to first give the Bio Pac automatic bowl cleaner a try when I became frustrated with the rings in the toilet. I clean it regularly, but it seemed like those rings were forming every night. Gross looking toilets are not good, so I figured I would see if any cleaning products were specifically geared towards helping. I'm also into environmentally friendly products, so I searched for green toilet bowl cleaners and Bio Pac's product came up.
Aside from the auto bowl product itself, Bio Pac seems like a solid company: they are a family-run company that has been around since 1991. From their website at http://www.bio-pac.com:
"Our biodegradable cleaning products are super concentrated, contain no animal ingredients and are never tested on animals. Bio Pac, Inc. donates a percentage of our profits to groups involved in wilderness and watershed preservation." Sounds like nice people.