See the dirty water you are flushing out from your filter system. An indicator of when you should stop backwashing your filter to save good mature pond water. Unions are on both ends for easy installation and maintenance.
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.
