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I recently had the concrete around my pool sanded and painted. The workmen also sanded and spray painted the aluminum coping around the pool. After they vacuumed out the debris from the pool, the entire liner had a splotchy brown stain on it. The stain responded to Vitamin C and I successfully treated it with Ascorbic Acid. Is it possible that the aluminum dust from the coping caused this staining? I had just shocked the pool the day before they started work and the pH and alkalinity were good.
Our concrete inground pool was emptied and left dry for a little too long. It then rose up on one side by about 2-5°. And a small crack across the middle from side to side. While running I thought I could fill the crack and relevel the sides and normalise the tilt. Or does it need to be condemned and rebuilt? Will upload pictures tomorrow.