Ultra concentrated citrus granular formula stops odors and breaks down waste in RV or marine waste holding tank. Environmentally safe. 1 drop-IN treats a 40 gallon tank. Resealable bag contains 15 Drop-INS. No. 41189: Size: 26.25 oz, Pkg Qty: 15, Package Type: Bag Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!