Always Fresh is a secret recipe of minerals that is the strongest treatment available for RV and marine vehicle holding tanks and drains. Our recipe is odorless, colorless, free of formaldehyde and free of toxic chemicals. Always Fresh stops odors before they start with antimicrobial minerals and enzyme assisting minerals assist in the breaking down of organic material in holding tanks and drains. Always Fresh has many uses including as a safe drain cleaner that will not damage pipes or seals in an RV or boat. We have been manufacturing this product for the past 40 years and have very loyal customers who swear by this product and its effectiveness. Read below our testimonials that we have received by mail from our customers. If you have any questions about the product or wholesale inquires, please use the contact information above