Ef-Chlor (NaDCC tablets) is a broad spectrum fast acting sanitizer and water sterilizer, rapidly effective against BACTERIA, VIRUSES, FUNGI, and PROTOZOA. Total spectrum of activity is effective against hydro hypophilic viruses, Gram positive & Gram negative bacteria, fungi mould, yeast, mycoplasmas and protozoa. A solution to growing pollution of Mineral water bottles is offered by our portable drinking water purification tablets providing clean, bacteria and germ free water, anytime, anywhere! These tablets are extra strength - one tablet will purify 1 GALLON of water. Don"t waste your money on tablets that are less potent. Advantages RECOMMENDED by leading infection control experts worldwide. EFFECTIVE against virtually all known bacteria, viruses, and spores. SAFE to handle and store. ECONOMIC and ACCURATE - no under or over dosing. GREATER BIOCIDAL EFFECT - Rapid release of HOCI encouraging fast biocidal activity forming clear disinfecting solution. MORE ENVIRONMENTALLY FRIENDLY than alternative disinfectants. FAST DISSOLVING and ready to use quickly. STABLE tablets with 2-3 year shelf life. RESISTANT to organic spoilage.