Is your pool showing stubborn, unsightly stains that are tough to remove? To restore your water to its sparkling best, learn about the most common types of pool stains, what causes them, and how to get rid of them effectively.
Types of Pool Stains
Organic Stains
If leaves, acorns, or algae sit in your pool for too long, they can leave behind brownish discoloration even after removal. These are known as organic stains, and they’re caused by organic materials that remain undisturbed in the water.
Metal Stains
Metal stains are often rusty or reddish in appearance and usually come from metals in the water, as well as corrosion from ladders, pipes, or other pool equipment.
Iron is one of the most common culprits, as it’s found in many pool chemicals and plumbing materials. To check for iron stains, try the vitamin C test: hold a vitamin C tablet against the stain. If it lightens or disappears once the tablet dissolves, iron is likely the cause.
How to Treat Pool Stains
Treatment depends on the type of stain. For organic stains, a chlorine shock treatment combined with brushing usually works well. Enzyme-based products can also help break down organic residue.
Metal stains are more challenging. They often require specialized pool chemicals that contain acids such as ascorbic or diphosphonic acid. These stain removers are most effective when applied directly to the stain.
If metals are entering through your water source, consider using metal sequestrants. These chemicals bind to metals and help prevent new stains from forming. Keep in mind that sequestrants break down over time, so regular reapplication is necessary.
As with most pool issues, prevention is the best solution. Regularly skim and clean your pool to remove organic debris and test your water for metals at the source when possible. By staying proactive, you’ll reduce the chance of stubborn stains that may be difficult—or impossible—to remove later.
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