Help! Pool is 7 years old. Black stains everywhere! It’s definitely not algae. It’s a vinyl liner in an above ground pool. Don’t know what to do!

[Perry_92]

 

[JamesW]

Looks like black algae or something growing under the liner. Maybe a bacteria, mold or fungus.

 

[Perry_92]

Looks like black algae or something growing under the liner. Maybe a bacteria, mold or fungus.

That sounds bad. Does that mean a liner change?

 

[JamesW]

I would try a SLAM and brushing to see if it clears up.

If not, you might need to replace the liner and remove the contamination beneath the liner.