DuraBulbTwin Pack Replacement 18W UV (Ultra Violet) Bulb Lamp for Pond UVC Filters & Clarifiers

I bought this product and fitted it at the end of May. The water cleared straight away. The UV light was visible through the window in the filter. However the water quality now is not so good and when I checked the UV (lilac light) it was not visible and its only the end of June.. I dont know if the bulb is faulty or the gas leaks out but it was not the bargain I had hoped for. I have paid more in the past and expect to leave a bulb in for a year. Disappointed.

These lamps are in the filtering system to help eradicate green water, the water in my Koi pond is spotless,and these must be replaced every 8 to 12 months to be effective.

Arrived quickly work well, ordered 2 only needed one but wanted spare tested both and they are of good quality and good delivery time

Great value bulbs. Used for a UV filtration filter replacement. Pond was clearing in a matter of days!

Great value quick delivery i will buy again recommended thank you