The Hagen PT1504 water filter is designed for the following applications:
The Pressure-Flo 2100 UVC Pond Filter - PT1504 provides purifies pond water and increases clarity. This pond water filter provides mechanical and biological filtration, as well as ultraviolet water sterilization. This UVC filter can be installed in or above ground, has a clogging indicator to remind you about cleaning, and a Backwash cleaning system for your convenience.
Pressure-Flo 2100 UVC Pond Filter - PT1504 specifications: