For a very heavy bloom "very bright sunlight" they take up to 2 weeks to
clear the pond....i have had mine for 3 years already with the same
bulb.



The bulb catches up during the night when there is no sunlight shining
on the pond. So if you have some cloudy days it works much faster.


Also make sure your to buy an oversized unit for your pond....that way
if you do have lots of sunlight you will get faster results.