United Chemical Yellow Treat Pool Algaecide 2 lb — Fast-Acting Concentrated Mustard & Yellow Algae Killer

Yellow Treat by United Chemical is a concentrated algaecide designed to eliminate mustard and yellow algae quickly in saltwater, chlorine, and freshwater pools.

Introduced in 1981, Yellow Treat has a long track record as a targeted solution for stubborn yellow and mustard algae. Its concentrated formula requires only 5 ounces per 10,000 gallons to treat heavy infestations, dissolves directly into pool water, and avoids staining pool surfaces. That combination delivers a fast, professional-strength response that fits both emergency cleanups and routine maintenance.

How quickly will Yellow Treat clear yellow or mustard algae?

Yellow Treat is engineered to act fast on mustard and yellow algae; many users see visible improvement within 24 hours. Complete clearing depends on algae density, filtration, and follow-up brushing and shocking.

• Visible results frequently within one day for light to moderate blooms.
• Dense or long-established infestations may need 24–72 hours plus brushing.
• Works with standard pool filtration; run pump and filter continuously during treatment.

Will this product work in saltwater and chlorine pools?

Yes — Yellow Treat is compatible with saltwater, chlorinated, and freshwater systems, making it versatile for most residential and commercial pools. There’s no special system conversion required before application.

• Safe for use in both above-ground and inground pools.
• Mixes directly into pool water without pre-dilution.
• Follow with recommended shock to oxidize remaining organic material.

How do I apply Yellow Treat for best results?

Application is straightforward: measure, pour, brush, and run the filter. Use the stated dosing—5 ounces per 10,000 gallons—and pair with brushing and a subsequent shock for thorough cleanup.

• Measure 5 ounces per 10,000 gallons (one bag or capful per 10,000 gallons).
• Pour across the pool surface, brush affected areas, then run filtration continuously.
• Shock the pool afterward to help remove dead algae and restore water clarity.

Does Yellow Treat stain pool surfaces or require special care?

No staining ingredients are included in the formula, and the product is formulated to be gentle on pool finishes while tough on algae. Normal post-treatment filtration and brushing keep surfaces clean and help avoid residue buildup.

• Contains no staining agents—safe for vinyl, plaster, tile, and fiberglass finishes.
• Rinse and brush surfaces as algae die off to prevent accumulation.
• Continue routine water testing after treatment to rebalance chemistry if needed.

Who is this for: United Chemical’s Yellow Treat is suited for homeowners, pool service professionals, and facility managers who need a reliable, no-frills solution for mustard and yellow algae. Whether you maintain a small above-ground backyard pool or manage a large inground installation, Yellow Treat offers a compact, professional-strength option to restore water clarity quickly and with minimal fuss.