Home » Oase 9 Watt Replacement UV Bulb

Oase 9 Watt Replacement UV Bulb

SKU: 40964
$47.99

Replacement 9-watt UVC bulb for OASE pond filters with integrated UV clarifiers. This genuine OASE UVC bulb eliminates green water and controls algae by destroying single-celled algae as water passes through your filter.

Key Features:

  • Official OASE 9W replacement UVC bulb
  • Eliminates green water caused by suspended algae
  • Controls algae growth for crystal-clear water
  • Easy to replace—no tools required
  • Long-life UVC technology

Why Replace UVC Bulbs:

  • UVC output diminishes over time, even if the bulb still lights up
  • After 8,000-10,000 hours (approximately one season), effectiveness drops significantly
  • Old bulbs won't eliminate green water or control algae effectively
  • Annual replacement ensures optimal algae control
  • Recommended replacement: Every spring at the start of pond season

Compatible With:

  • OASE BioPress 1600
  • OASE BioSmart 1600
  • OASE Filtral 800
  • OASE Filtral 1200

What's Included:

  • 1 genuine OASE 9-watt UVC replacement bulb

Note: This 9W bulb is compatible with multiple OASE filter models. Make sure your filter uses a 9W bulb before ordering. Check your filter model or measure your old bulb to confirm.

Frequently Asked Questions

Q: How often should I replace my 9W UVC bulb?
A: UVC bulbs should be replaced annually, typically at the start of the pond season in spring. Even though the bulb may still light up and appear to be working, the UVC output diminishes significantly after about 8,000-10,000 hours of use (roughly one season of operation). After this time, the bulb won't effectively kill algae or eliminate green water, even though it's still glowing. Replacing the bulb each spring ensures you have maximum algae-fighting power for the upcoming season.

Q: My bulb still lights up—do I really need to replace it?
A: Yes! This is a common misconception. The visible light you see is not the same as the UVC light that kills algae. UVC is invisible to the human eye and operates at a specific wavelength (254 nanometers) that damages algae DNA. Over time, the UVC output degrades while the visible light remains. So your bulb can look perfectly fine and still be ineffective at controlling algae. If you're experiencing green water despite your bulb lighting up, it's likely time for replacement.

Q: How do I know if this 9W bulb fits my filter?
A: This 9W bulb fits OASE BioPress 1600, BioSmart 1600, Filtral 800, and Filtral 1200 filters. Check your filter model number, which is usually printed on a label on the filter unit. You can also check the wattage marked on your old bulb—if it says 9W, this is the correct replacement. If you have a different OASE filter model or a different wattage bulb (like 5W, 13W, 18W, or 36W), you'll need a different replacement bulb. If you're unsure, contact us with your filter model or a photo of your old bulb.