It is several feet of pipe that is filled with gunk, and it may take several days for the bacteria to eat through this long blockage. Therefore, we suggest that a mechanical cable be used to restore flow. Regular maintenance treatments will prevent new build-up. Some people notice improvement in a day or two. Almost everyone will see results in one to three weeks.
Hair takes the longest to digest.
Do not flush for 6 - 8 hours. The quart of mixture poured into the bowl pushes one quart of water and mixture out of the bowl into the stack. The enzymes and bacteria carried out in the quart leaving the bowl are deposited on the gook coating the pipe. In the following 6 - 8 hours they embed themselves in the gunk so that when the toilet is next flushed they will not be flushed out. The strongest chemical in the World can't climb the side walls of horizontal pipes.