<strong>This product is final sale. </strong>RezBlock is a resin preventer, made with natural extracts of fruits and vegetables, purified water and citric acid, that stops resin from sticking to the glass of smoking accessories. RezBlock is completely organic, which means the water will need to be changed regularly. The cleaner will not affect taste and will provide up to 60 uses per bottle. Just a few drops are needed with every water change. It’s available in a 15 mL bottle.