Rust Stains?

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We have what look almost like rust stains on the liner. At first we thought they might be from leaves that were on the bottom over the winter. Then we thought it could be algae so we brushed it and tried algaecide but that didn’t help. The folks at Leslie’s said we should try stain and scale remover, but that didn’t help either. Any suggestions?

Ask the Pool Guy Changed status to publish July 19, 2019
Where on the liner is it showing up? Localized in one spot or all over? Walls or Bottom? How do the screws on the skimmer look – rusting at all? And the Pool Light? Look okay or turning orange?

If it’s metals – you’d notice all the screws turning orange. I’d use a container of Natural Chemistry Stain Free – here is an amazon link: https://amzn.to/2XD6XO7
Followed by SeaKlear to help the filter trap it : https://amzn.to/2XwRNKi
The stainfree will eat all available chlorine in the pool – so the level should be low when you add it, takes ten minutes tops to do it’s thing – dump in the area, I use entire container – then brush spots – then add the seaklear – filter continually and backwash as needed. Reintroduce chlorine (slowly) if you shock all at once it’s going to redeposit metals on the liner (if indeed it was metals).
Chlorine takes out organic things, tanins from leaves etc. It’s organic if a chlrorine tablet will lift it off.
Stainfree (ascorbic acid) takes it off if it is metal. But then you have to remove metal from the water and prevent issues in the future – alkalinity of 100 and pH of 7.6 are target numbers. Calcium should be at 200ppm as well.
Let me know if any of the above make sense?
The only other issue could be a liner mold coming through the bottom of the liner – less likely – but possible.
or, yellow (mustard) algae[amazon_link asins=’B00C5L7NWU,B0017T0IZ0,B00AO8OB4E,B00KMOLWGK’ template=’ProductCarousel’ store=’asthpogu-20′ marketplace=’US’ link_id=’4a4bfe0b-eb7c-4a93-b743-7e64f089e7e8′]
Ask the Pool Guy Changed status to publish July 19, 2019

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