Black pond liner - white stuff?

  • We are currently upgrading MFK. thanks! -neo
I know it comes off semi easily but it's on the entire walls of my pond. It's going to look like milk if I rub it all off.
 
It definitely "grows" in my pond, I usually take a pack of scrubbies to it every 6 months or so. Just do it right before a water change and you'll be fine, albeit sore in the arms.
 
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