Environmentally Acceptable Pipe Cleaners (DE-UZ 24)
Please note that there is a newer edition.
Effective pipe cleaning without the use of chemicals
It is true that often chemical pipe cleaning agents can be more easily used but, unfortunately, they mainly consists of strong alkalis and salts which contribute to the salinization of our water bodies and may even form irritant gases. Traditional mechanical pipe cleaners do without such aggressive chemicals and work equally well.