Products to Control the Effects of Ammonia & Nitrite Problems and Beef Up the Biological Filter. Fish cannot live very long in a pond that has no nitrifying cycle in place. The ammonia and nitrites will kill the fish. The trick is to prevent ammonia and nitrite spikes from occurring by installing a proper biological filter where good bacteria can thrive and create the nitrifying cycle.
Most pondkeepers know that the best way to ensure clear pond water is with an ultraviolet sterilizer. Some often overlooked factors are what to do when the UV light is not doing the job anymore. Usually, this is a simple as an old lamp. Depending on the brand, UV lamps should generally be replaced about every 12-15 months of use.
