Light brownish stains on liner

[dschddny]

Hi all, we have some light brown stains in numerous areas on the liner, at the bottom of the pool. Water chemistry is all good - I spiked the chlorine level high at the beginning of the season and cleared the water, water is nice and clear just have these stains now.

Is this due to metals or algae? Possible ways to remove and/or prevent this?

Thanks in advance!
Dave

 

[borjis]

I have the same issue. It's iron typically. there's a lot of threads if you search for iron stain removal.

 

[JamesW]

Put some vitamin C on a spot.