Jim and I have used a UV for several years. Last year, the housing
had to be changed (Tetra made good on a faulty piece of equipment).
For the first part of the spring, we did not use the UV. Then the
water began to cloud. Now it has a greenish tinge. Jim decided to
change the bulb...after 2 years. When he opened it, he got a
surprise! He had forgotten to put the bulb in the new housing! NO UV
was definitely not enough to handle the early algae as the veggies are
kicking in. We expect clearer water in a few days.

Phyllis