Understanding how water chemistry affects pool surfaces and equipment
Corrosion and rust stains are common problems in both residential and commercial pools, especially in areas with high humidity and frequent metal exposure, such as South Florida and the Florida Keys. These stains not only affect appearance but can also signal chemical imbalance that may damage pool finishes, heaters, rails, and other metal components over time.
At MSP Supply, we help pool owners and professionals identify the cause of corrosion and provide the right products to restore, protect, and prevent future damage.
What causes corrosion and rust in pools
1. Low pH and unbalanced alkalinity
When the pool water becomes too acidic (low pH), it begins to attack metal components and etch pool surfaces. Low total alkalinity reduces the waterβs ability to buffer pH swings, making the pool more aggressive and accelerating corrosion on ladders, light rings, handrails, and heater cores.
2. High metal content in the water
Iron, copper, and manganese can enter the pool through source water, worn equipment, or certain chemicals. These metals oxidize when exposed to chlorine, leaving brown, orange, or bluish-green stains on plaster, tile, or vinyl.
3. Galvanic corrosion between dissimilar metals
When stainless steel, copper, and brass components are in contact in saltwater systems, an electrical charge can form and corrode metal parts over time. Saltwater pools are especially prone to this if bonding and grounding arenβt properly maintained.
4. Poor chemical control and over-chlorination
Over-shocking, using acidic cleaners, or neglecting water balance can strip protective coatings from pool finishes and fixtures, exposing raw metal and increasing stain potential.
How to prevent and treat corrosion and rust stains
1. Maintain proper pH and alkalinity balance
Test pool water regularly and keep pH between 7.4 and 7.6, with total alkalinity between 80β120 ppm. This helps prevent water from becoming corrosive.
2. Use metal control products and sequestrants
Metal control chemicals bind and hold metals in solution, preventing oxidation and surface staining. MSP Supply stocks professional-grade metal removers and scale inhibitors ideal for both residential and commercial pools.
3. Clean and protect metal surfaces
Regularly inspect and clean ladders, rails, and light rings with non-abrasive stainless steel cleaners. Applying a protective coating helps extend the life of exposed metal parts.
4. Choose corrosion-resistant equipment
When replacing heaters, lights, or fittings, look for parts with stainless steel or polymer housings. MSP Supply carries multiple equipment options designed to withstand saltwater and coastal conditions.
Shop corrosion and stain prevention products at MSP Supply
At MSP Supply, we offer a full selection of chemical and equipment solutions for corrosion and stain control, including:
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Metal and stain control chemicals
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Scale and corrosion inhibitors
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Pool surface cleaners and spot removers
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Replacement ladders, handrails, and fittings
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Salt-system-compatible heaters and lights
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Water testing kits and digital meters
Our team can help you select the right products for your specific pool surface, system type, and water conditions β whether youβre maintaining a residential pool or managing a commercial property.
