Hi

I only have a 1064L pond (about 1.4m x 1.9m x 0.4m), and have been trying for a year and half to make it clear naturally. So have pond plants and a normal bio filter (one of them boxes with foam and sections of pipes in it). But have failed to clear it naturally so installed a Tetra 9W 8000L UV clarifier. Its installed just before the water goes into the filter.

The guy at the garden centre said it should take 4 to 5 days and it will end up crystal clear. But its been on about a week now and I cant see any difference, pond is still pea soup. I can only see an inch or two down.

The filter light is on indicating it working (although I assume UV light is invisible so I cant tell if the bulbs are working but the bulbs dont look broken). I dont know what pump is being used.

I wondered how long these things usually take to work? And if it clearly is not working what could cause it to not work considering the UV clarifier is working and the bulbs dont look broken.

Thanks!