Bubble tablets clean the bottom of your pond and help clean your filter.  Aquascape's bubble tabs have eight kinds of bacteria to keep your water biologically balanced.  This concentrated bacteria with added enzymes combine to help clean pond water.  There is oxygen added that helps spot treat problem areas. 

Aquascape Bacteria Bubble Tabs contain 8 pure strains of concentrated beneficial bacteria, including enzymes. This combination of natural cleaners helps to maintain a strong biological balance in your pond. Aquascape Bacteria Bubble Tabs maintain a strong biological balance providing clean, clear and healthy water conditions.