Where we mention Clorox Pool & Spa Scale, Metal & Stain Control, 1 Quart

• Calcium Hardness in Pool Water: What It Is, Ideal Range, and How to Adjust It

  Sequestering/scale-control agent · Best for: Conditional metal and scale management when the test and label support it

• Pool Metal Stains: How to Identify Iron, Copper, and Manganese and Remove Them Without Draining

  Best sequestrant (prevents metal restaining after treatment) · Best for: Mandatory follow-up after ascorbic acid treatment. Sequestrants bind dissolved metals so they can't re-oxidize and restain. Use 4-6 oz per 10k gal weekly until the metals are flushed via drain + refill.

• Pool Calcium Scale: How to Remove It and Stop It Coming Back

  Primary stain + scale prevention · Best for: Stopping fresh scale deposits and lifting light calcium stains while you correct water balance