Description
Master Clear Metal Protect: Spa Metal Stain & Scale Prevention
Protect your hot tub surfaces and equipment from metal staining and mineral scale with Master Clear Metal Protect. This 32 oz liquid sequestrant formula by Nature’s Choice prevents dissolved metals and heavy minerals in your water from depositing on spa surfaces, plumbing, and heater elements.
Key Features & Specifications
- Type: Liquid metal and mineral sequestrant
- Size: 32 oz bottle
- Prevents: Metal staining, mineral scale buildup, and surface discoloration
- Addresses: Purple crystal formation caused by copper or manganese in water
- Application: Add 1/2 bottle at each spa startup or water fill
When to Use Metal Protect
Metal sequestrants are especially important if your source water contains elevated levels of iron, copper, manganese, or calcium. Common signs of metal problems in spa water include green or brown staining on surfaces, purple or blue crystals forming on the shell, and discolored water after adding sanitizer. Adding Metal Protect at each fresh fill helps prevent these issues before they start.
How It Works
Metal Protect uses sequestrant chemistry to bind dissolved metals and minerals, keeping them suspended in solution so they can be removed by your filter rather than depositing on spa surfaces. This protects the spa shell, jets, plumbing, and heater element from staining and scale damage.
How to Use
Add half the bottle (16 oz) each time you drain and refill your spa. Run the circulation pump for at least 30 minutes after adding. If you experience purple crystals or metal staining between water changes, an additional dose may help. Always test and balance water chemistry after adding any treatment product.




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