string algae is what is in all the natural streams at this stage.
what are your water quality parameters, ammonia, nitrites, nitrates?
I use a bucket filter over winter, and in a couple weeks will get my veggie filter
and the UV going. my water lilies are putting up new leaves... altho they never did
actually die back under the plastic. Ingrid

John Bachman wrote:

We are in zone 5. My pond is up and running but gets uglier every
day. Algae is building. The water temperature is 50 F and the fish
are moving about regularly.

With no plants there seems to be no hope of controlling algae. Are
there any plants that will grow and remove nutrients while the water
is so cold?

TIA

John




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