15W Philips Ultraviolet (UV) Replacement Tube bird treats 2 Blocks Treats up to

2 Blocks Treats up to 1

4 (after 2 hrs mixing or aerating) Alkalinity 2

you can tailor the effect to your liking

Reduce the amount fed on the day before and the day after a pond water change to help maintain water quality and reduce stress on the fish

15W Philips Ultraviolet (UV) Replacement Tube bird treats 2 Blocks Treats up to15W (t8) Philips Ultraviolet (UV) Replacement Tube 15W Philips Ultraviolet (UV) Replacement Tube is used to purify well water and other problem water sources by killing 99% of bacteria, viruses, and protozoan cysts. Kills 99% of bacteria, viruses, and protozoan cysts. The perfect solution to purifying well water and other problem water sources containing excessive microorganisms like water from lakes, streams, and ponds. Approx Sizes of UB Bulbs: 15W