The Filtrol 160™ washing machine filter comes with a 90-day money back guarantee from the manufacturer. If after using the Filtrol 160™ for 3 months, you don't think it is protecting your system, call us toll free at 1-877-925-5132 to arrange return authorization for a full refund (minus shipping). Most people, after seeing how well the Filtrol-160 works, begin recommending it or giving them as gifts to their friends and neighbors. After all, the only thing worse than having a failed system is living next door to one. Some people say that after using this Filtrol-160 filter (and stopping the constant assault of material fibers), their sluggish and failed systems have started working again.