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https://www.swelluk.com:443/swell-filter-box-premium-36w-pls-uv-bulb/ 
Swell Filter Box Premium 36w PLS UV Bulb
A perfect single ended, twin bulb replacement for your UVC, this Swell 36 Watt PLS UV Bulb comes at a fraction of the price of branded bulbs but does just the same job, with great performance. Replace, as always, every 6 months to ensure your UVC is functioning perfectly.
Product Information
Easily keep algae and pathogens at bay with a high quality Swell 36 watt PLS UV replacement Bulbs/Tubes.
The UV light clears and cleans the water of cloudiness, green water issues and as such makes sure it is healthy for fish and plants.
Swell bulbs use only the highest materials in their replacement bulbs, and by using high-quality UVC lamps guarantees a long service life.
FEATURES:
- Single ended, twin tube with two pins at one end
- High UV output allows for greater algae control
- Replacement bulb for the Swell Box Filter 45000