Walex Porta-Pak RV Holding Tank Treatment is the gold standard in RV sanitation. Trusted by RVers worldwide, this powerful drop-in deodorizer is the industry's odor control powerhouse. If you need a product that will withstand heavy use and hot climates, Porta-Pak is the clear choice. Just drop one Porta-Pak sachet into your RV toilet and let it work its magic. No measuring, no mess, just fast, effective results that last up to a week. This Fresh Scent pack will make your RV feel a little more like home. Whether you're a weekend warrior or a full-time RVer, you can count on the power of Porta-Pak.• Eliminates foul black tank odors for up to 7 days• Pre-packaged portion control â no mess• Breaks down waste and paper• Delivers powerful odor control, even in extreme conditions• Helps maintain black tank and sensors• Formaldehyde-free and 100% biodegradable• One Porta-Pak controls odor and treats waste in up to a 40-gal. holding tank• Manufactured by the global leader in waste treatment & odor control Pre-packaged portion control means no mess Formaldehyde-free & 100% biodegradable One sachet controls odor & treats waste in up to a 40-gallon holding tank | Camping World Walex Porta-Pak RV Holding Tank Treatment, Fresh Scent, 50-Pack in Black