Pond UV tubes should be replaced every spring. By changing the UV tube annually you will keep your pond crystal clear, which allows you to enjoy your pool. Ultra Violet light controls green water by clumping the microscopic algae cells together into larger lumps that are manually removed by your filter.
Q: Which size UV bulb fits my filter?
A: Swell UK have a simple solution to this question. Its as easy as 1-2-3
1. Select the manufacturer of your filter from the list below in the key section (or scroll down the page).
2. Find your filter model and size.
3. Look along the chart to locate the correct size bulbs for your filter. Click on the tick () and it will take you to the correct UV bulb.