Hello all! First-timer to the forums. We have a 16x30 inground saltwater pool with vinyl liner. Came here for those pesky little "tweeks" and knowledge. We put the pool in when we built our home in 2022 after the tornado of 2021 decided it needed our first home. Have had no issues until this year; we have scattered white patches upon opening. After reading, I think this is calcium plaque or possibly white mold? Doesn't move. Feels a bit gritty. Put muriatic acid and hardness in last week, per the pool store's recommendation. Water is crystal clear. Salt generator seems to stay right around 2100. I didn't know I'd find this forum, so I don't have the readings I took this morning, but just wondering if my suspicions - if anyone has experience with this? Thanks in advance.