If you’ve noticed stubborn white crusty spots creeping along your pool walls, you’re not alone. Many pool owners run into this problem, especially as the swimming season winds down or after a long stretch without refreshing the water. While they may look harmless, these deposits can make your pool less inviting and, if left unchecked, can even damage surfaces over time.

The good news? With a little understanding of why they happen and a few simple steps, you can keep your pool looking clean, clear, and inviting year-round. This week, we’ll walk you through what causes white calcium deposits, how to prevent them, and—if they’ve already appeared—how to get rid of them.