Pool loungers discoloring

[CColston]

So I bought some pool loungers (not ledge loungers but similar in design) from a friend that purchased them off of Amazon. They are white but now the part that is underwater has yellowed? Is it because of my pool water or just due to quality of chair? I’ve searched online and no one else seems to have had this problem but surely I am not the only person this has happened to? Picture is before they started yellowing.

 

[ajw22]

Try the stain identification process described in Stains in Your Pool - Trouble Free Pool using vitamin C or dry acid and see if the stains are caused by iron or copper in your pool.