Hello, we appreciate you for giving our RID-X Septic Treatment Powder a try! This box is 5 monthly doses for septic tanks up to 1500 gallons. For best results pour 1/5 of RID-X into the toilet, then flush twice. It might be helpful to know that RID-X is available in three forms which are powder, pacs, and liquid. We recommend you try RID-X Septic System Treatment Septi Pacs for a better experience. Our Septic-Pacs contain one dose of our powerful, concentrated formula to make RID-X septic treatment easier than ever before. These easy-to-use dissolvable pouches are scientifically proven to break down the waste that can cause septic backups. Please be rest assured we have shared your feedback with our team for future planning. For any further assistance, please call us at 1-800-235-6052 between 9:00-5:00 EST (Monday - Friday) or send us an email on the Contact Us page on our website including the following case number RB0000425954. We look forward to hearing from you! Sincerely, Your RID-X Team!