It doesn't seem to be. I use a good slug of CS in each birdbath when we clean and refill them every evening. Sometimes I let it go without a week or so. But mostly we put it in. It helps keep the baths from getting that pink slime, and it did get rid of the black/green stuff (algae?) in the bird fountain, too. We have been doing this for years, and I think if it hurt the birds, with the numbers we get daily, we'd be seeing a lot of dead ones. As it is the rate of disease we see in the birds is now almost none. We used to see a lot of those deformed, bald swollen eyes, and bald lumps on their heads. I forget what the name of the diseases are, but I looked them up once, and they are very contagious. Our birdfeeding area is largish, and we have a lot of feeders and a large number of bird visitors daily. During the day, the birdbaths get rinsed out and re-filled at least once a day in addition to the evening rinse and fill, sometimes up to 3 times a day because they get so dirty.
sol

Shirley Reed wrote:

  Yes, I'm sure it would improve the germ
quality of the water, but do you think it would
be detrimental to the birds digestive tracts? tia pj


                


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