black stains

Hi! We recently got our pool replastered with Diamond Brite (Oyster Quartz). After an acid-hot start, we balanced the pool water and added chlorine. The water was acidic for about a week as the pool guy ghosted us & we had to find a new person. The pool guy added a lot of chlorine with pucks...

Hi Everyone, I'm brand new to pool ownership and we noticed that when we opened the pool for the first time, there were these black stains scattered around the bottom and sides of the pool. The pool is a salt water pool and has a vinyl liner about 7-8 years old (I've been told). The previous...