This is a genuine double ended Hozelock 16w UVC Replacement Bulb, part number Z11116, which is suitable for a Hozelock EcoPower 9000/10000 Pond Filter. These bulbs will also fit many other brands of filters, not just Hozelock. Bulbs should be changed every 6 to 12 months as their performance will deteriorate over time. Please check your manual to make sure you are buying the correct wattage - or feel free to get in touch if you need help.
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