Your toilet needs Bio-Clean too!!! The vent that helps your toilet drain propersly can become clogged and impair it's proper operation making it flush slowly sometimes it may gurgul. To treat your toilet, mix 2 scoops of Bio-Clean with a quart of warm water and dump the quart of water ito the toilet, let it sit 6 to 8 hours. Don't flush until the next use, this will give Clean Gene and his buddies a chance to get up into the stack and when you pour the quart of Bio-Clean solution in the toilet the it must let out a quart of water, this lets enough of the solution out just beyond the toilet where it can get to the stack at the water line. Once it makes contact with the buiildup in the line it can start eating it's way up the stack until all the gunk is gone and there is nothgin left to consume. This treatement is a preventive measure to keep the toilet flushing well and should only need repeating once a year to keep the stack operation at full capacity.
**Please note - There are lots of mechanical reasons for a slow toilet and gurgling including a clogged sewer line getting ready to back up on you. If you are experiencing these symptoms now call your local plumber, it is more likely because of the sewer line being clogged, or the toilet jets being clogged, or even the toilet not filling properly.