Liner question

[tommyboyrn]

I am starting my 3rd year on liner in-ground SW pool. I vacuumed the pool today to get areas the robot doesnt seem to get. I noticed these "lines" in the liner on the bottom. Seem to correspond to areas on the install. No leaks detected. Just wondering if they are something to worry about or not. Thanks for the info in advance

 

[jbird0215]

I have similar lines. I don’t particularly like them but I don’t think it’s anything to worry about.
View media item 144173

 

[tommyboyrn]

Thank you

 

[borjis]

Those are the welding seams. It fastens the strips together when it's cut & made. No worries.