Five Star Beer Stone Remover - 8 oz. Remove all that pesky build up on the interior of your brewing equipment with this beer stone and scale remover. Directions: Use at rate of 1 oz. per gallon of water. Allow contact time of 10 min. Drain and allow the surface to air dry. Rinse and sanitize just prior to next use. For stubborn scale or stone follow standard instructions but do not dilute. Apply full strength to area.