The Aqua ClearPro pond gel balls from Ubbink are a probiotic pond water care product that supports the biological breakdown of excess nutrients. The Ubbink Aqua ClearPro gel balls produce naturally clear water. The enzymes they contain, such as amylase, help break down excess food and split the excess cellulose, which leaves and dead plants are largely made of. These Aqua ClearPro gel balls can be used in the spring and are a curative treatment that may be necessary two to three times a year. 1