Coral Seas Yellow Out Pool Shock 2x4lb – Algae Control & Quick Chlorine Boost

Overview

Coral Seas Yellow Out is a high-performance pool shock treatment designed to tackle algae and support balanced water chemistry without leaving stains or harsh residues on your pool surface. Delivered as two 4-pound pouches, it gives you a flexible option for regular maintenance or after a green episode.

What it does

Engineered to target a range of algae colors green, brown, pink, and mustard, Yellow Out helps restore clarity by delivering a strong oxidizing dose when activated with an oxidizer. It dissolves instantly with no brushing required, so you can quickly reestablish inviting water even after a busy weekend.

Key benefits

• Multi-purpose dose raises free chlorine, supports water hardness, and nudges pH toward balanced levels.
• Fast-acting chlorine boost helps you recover clearer water faster.
• Dissolves in seconds with no scrubbing required.
• Safe for plaster, fiberglass, vinyl, and salt systems.
• Targets multiple algae strains for broader control in one treatment.

How to use

• Never premix Yellow Out with chlorine or other chemicals.
• Dissolve the powder in a bucket of water before adding it to the pool.
• Use 2 lb per 15,000 gallons for a standard treatment, or 1 lb per 10,000 gallons for smaller pools.
• After adding Yellow Out, wait 5 minutes, then add your oxidizer (chlorine, bleach, or non-chlorine shock) to activate the treatment.
• Run your circulation system after application and avoid swimming for 8-10 hours if practical.

Timing and safety tips

For best results, apply at night when the sanitizer can work steadily under cooler conditions. Always follow the label directions and use the correct dosage for your pool size to maintain balanced water.

Who benefits

Ideal for residential pools with plaster, fiberglass, vinyl, or salt systems. Also suitable after heavy rainfall or heat waves when water can look dull, making it a convenient option for regular maintenance.

Maintenance and results

Used as part of a balanced program with an oxidizer, Yellow Out supports clear water and consistent sanitizer levels. It complements other pool care steps and helps you maintain a welcoming pool surface between cleanings.