Improve your water quality wit this attractive, floating planter. Barley straw planters act as a natural filter, keeping the water in your pond clean and clear. Will not harm fish or plants, treats pond for 6 months. No danger of koi nibbling. Plant houseplants or other non submersible species in planter and release in pond. Size is 500 Gallon. Dimensions are 6 X 6 X 3.3 Barley Straw. UPC Code = 018506011383