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The Laguna PT1521 is the correct replacement UVC lamp for the following:
The Laguna Pressure-Flo Replacement PT1521 UVC Lamp is a replacement lamp for the Pressure Flo 2100 UVC Filter. The 20-watt Pressure-Flo lamp fights the growth of single-celled algae organisms in water. This pond UV bulb should be replaced once a year to achieve the best results.
Laguna Pressure-Flo Replacement PT1521 UVC Lamp specifications: