12 weeks (Each unit lasts up to two weeks) of freshness. Prevent toiler rings & limescale. Neutralizes odors. Self-sticking gels. Hygienic touch-free application with single use applicator. Contains no phosphates. Single Use Gel Application: Apply the gel with a single use, disposable applicator. No cage, no hook, nothing to store. Continuous Clean and Fresh Toilets: Cleaning and freshness with every flush. Each application lasts up to 2 weeks. Safe for septic tanks. Just press & click. Health. Hygiene. Home. www.rbnainfo.com. how2recycle.info. Questions? 1-800-228-4722. For ingredient information, www.rbnainfo.com. Made in Mexico.