Biodegradable formula with no added preservatives, no coloring and no synthetic fragrance. Guaranteed effectiveness for these effervescent toilet tablets without packaging with the pleasant scent of lavender. Put 1 tablet directly into the toilet and leave to act for 30 minutes. Cleans - Disinfects - Descales They are made and molded by hand, then air dried. A little elbow grease, know-how and that's it! KEEP OUT OF REACH OF CHILDREN - DO NOT SWALLOW