how do you deal with reddish brown stuff on pond liner?

[Three Ducks in a Pond]

Hi, I am sort of new to ponds, and since last fall there has been like reddish-brown stain on my pond liner. Is there a way to somehow get it off without draining the pond? some sort of chemical that will get rid of it but won't hurt my ducks inside? if you have any suggestions, please let me know. Thanks

 

[Lisak1]

I think we'd need to know exactly what it is - can you rub it off? Is it slimy? It might be a form of algae, is my first thought.

 

[Three Ducks in a Pond]

oh sorry, it's a little slimy, and you can rub it off. from a distance, and with direct sun shining on it, it will have a greenish color, but up close it is like the dark red and brown.

 

[brokensword]

might be a type of diatoms, too.

 

[j.w]

I think you are just gonna have to scrub it off or just leave it be and just make sure the water is clean at least. You could try scrubbing w/vinegar but all that work and I think it will just come right back. I wonder if Hydrogen peroxide added to the water would work? It does not hurt fish if used correctly. Why do you want it gone? The ducks don't care as long as they have clean water.