Pool loungers discoloring

Ready2swim

Silver Supporter
Jan 7, 2017
14
Hallsville, Texas
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. EA93CDAC-026D-4261-BF45-22B0E47AB5F7.jpeg