The strongest National Brand 2x more enzymes (than the leading National Brand). 4 Monthly doses. Helps prevent septic back up. Safe for all septic system. Helps prevent septic backups (Along with occasional pumping). Breaks down paper, fats, oils, grease, protein and starch. Helps eliminate unpleasant odors and dampness in leach fields. Professional strength. Dual action formula contains natural enzymes for fast-acting breakdown and ultra-concentrated bacteria for continuous long term septic boost. Use monthly to maintain optimal septic system function and prevent costly backups (Along with occasional pumping). Contains no phosphorus. Guaranteed (Money back upon proof of purchase. Call 1.888.334.4890 for details, questions or comments about this product) to work or it's free! Double Guarantee: Satisfaction guaranteed or it's free + Give this bottle to your Roto-Rooter service tech & receive 10% off your next service call (Up to $10. At participating locations only. Promo Code: CLOG). Satisfaction Guaranteed: If you are dissatisfied with this product, contact rust-oleum product support at 800-466-7126 for product replacement or a full refund of the purchase price. Refer to product number and batch code. Call 1-800-466-7126 or visit rustoleum.com/rotorooter. Made in USA.