Pond pH Bufferâ„¢ is designed to raise pH and buffer decorative ponds without the use of phosphates. It is ideal for use with planted ponds containing koi, goldfish, or other pond fish. It is not eutrophic and will not promote algae growth. It is particularly useful in raising the pH in liner ponds. Buffers between 7.2 and 8.2, but preferentially around 7.4â€“7.6.