What is this white stuff on pool wall?

Katie C

Active member
May 23, 2023
38
Olive Branch, Ms
Pool Size
33000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
We have several spots of white lines on our pool wall. They look like caulking and are thick and hard to get off. Does anyone know what this is and best way to get rid of it? We have a Gunite pool. Thank you
 

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