Slowly lowers the ph of pond water making it more acidic without harming delicate pond fish or aquatic plants. A high ph limits the ability of aquatic plants to absorb necessary nutrients. Contains no algae-promoting phosphates. Size is 16 Ounce. Dimensions are 2.37 X 2.37 X 8.37 Phosphate-Free And Nitrate-Free. Will Not Promote Algae Growth. UPC Code = 317163161708