Winterizing a pool can be a great way to get it ready for the spring season, but it can also be dangerous to have dust particles in it.
This calcium can get stuck to your plastic fittings. It's similar to plaster dust except that the plaster is already cured.
White rings around the surface of aggregate are caused by the loss of calcium hydroxide. This chemical is commonly found in the interfacial transitions zones (ITZs).
The high pH of calcium hydroxide helps keep the pool's walls healthy. It also helps prevent the water from eating the walls during the winter. Unlike plaster dust, calcium carbonate does not appear immediately. This is because it is delayed by the warm water temperature.
It's believed that precipitation occurs as the water warms up, causing it to spike the pH and carbonate as dust.
This often comes across as calcium dust. In reality, it's not because of calcium carbonate, but because the water warmed up the LSI, causing it to precipitate calcium carbonate. In cold weather, people tend to try to keep calcium low to prevent scale. This is a very bad habit, and it's usually not a high-LSI problem.
If you have any other questions about pool and spa products please do let us know - we are here to help!