Yes, you can turn off your UV Clarifier in the winter, in fact we would advise you to turn it off, but you can leave it on if you want to.
During the winter months when the water temperature in your pond is low there is no need to keep your ultraviolet clarifier running, turning it off will save you money plus it will preserve the life of your UV lamp.
There are some ultraviolet filters that will turn off automatically when the temperatures reach a certain level.
The reason you can turn off your clarifier during the winter months is because the water is cold and the single cell algae that cause the water to turn green are not as active, it’s these single cell algae that you UV clarifier removes.
Do you need to remove your UV Clarifier from your filter system
If you have a stand alone UV Clarifier you should remove it from your filter system and drain it before storing it somewhere warm and dry and away from the possibility of frost damage.
Another reason why you would want to remove your clarifier is the rick of it freezing, if it does freeze this could damage the unit.
If your clarifier is built into your filter system there is nothing you can do but turn it off if you can.
When can you turn your UV clarifier back on
When the spring arrives you can turn your clarifier back on.
You may need to replace the UV lamp, this depends on the life expectancy of the lamp, many lamps will have a life expectancy of 12 months, if this is the case you can probably get 2 years out of your lamp if you turn it off for 6 months of the year.
If the life expectancy of your lamp is 6 months you will need to replace it in the spring, if you don’t turn off your UV clarifier over the winter months you will need to replace your UV lamp every spring.
If you have a UV lamp that has a life expectancy of 6 months and you want to keep your clarifier running throughout the winter you could get away with one lamp per year if you replace it every spring.
The lamp will be at its strongest during the spring and summer months when you need it the most and will still be effective during the autumn and winter months when there is less single cell algae around.