United Chemical Yellow Treat granular algaecide 4-Pack (2 lb) — fast mustard & yellow algae treatment

United Chemical Yellow Treat is a patented granular algaecide formulated to quickly eliminate mustard and yellow pool algae when used as directed.

Yellow and mustard algae form stubborn, powdery blooms that resist ordinary sanitizers and cloud pool water. United Chemical’s Yellow Treat (YT-C12) is an EPA-registered formula trusted by pool service professionals for over two decades to remove these specific algae types. Sold here as a convenient 4-pack of 2-pound containers, this granular algaecide is designed for easy dosing, compatibility with common sanitizers, and dependable results when followed by appropriate shock and follow-up care.

How does Yellow Treat remove mustard and yellow algae?

Yellow Treat contains a patented active ingredient tailored to penetrate and destroy the cells of mustard and yellow algae that typical sanitizers may not reach. It works as a targeted algaecide you add directly to the pool water, where it disperses and acts on visible blooms.

• Patented granular formulation dissolves and spreads through the water.
• Targets the specific cell structure of mustard and yellow algae.
• Designed to be used alongside superchlorination for best results.

What is the correct dose and application process?

Dosage is simple: one capful (about 5 ounces) treats 10,000 gallons of pool water. For visible blooms, add Yellow Treat, run the pump to circulate, then superchlorinate (shock) the pool to complete treatment and speed removal.

• Standard dose: 5 ounces per 10,000 gallons (one capful).
• After adding, operate filtration for full circulation.
• Follow with a shock treatment and maintain sanitizer levels until clear.

Is this safe for my pool type and sanitizer system?

Yes — Yellow Treat is compatible with chlorine, bromine, and chlorine generated by salt systems when used as directed. It is a granular product intended for typical residential and commercial pools; always read the label for specific pool-surface instructions and safety precautions.

• Compatible with chlorine and bromine sanitizers.
• Works with salt-chlorine generators when following label guidance.
• Suitable for most pool finishes—consult label for restrictions.

How should I prevent algae from returning after treatment?

After clearing the visible algae, maintain proper sanitizer and circulation and consider a follow-up algaecide or preventative product to reduce recurrence. United Chemical recommends routine maintenance steps to help keep water clear and algae-free throughout the season.

• Keep sanitizer levels in the recommended range and shock as needed.
• Run filtration daily and clean/ backwash as required.
• Use a follow-up algaecide or preventative product to help inhibit regrowth.

Who is this for: Pool owners and professional service techs dealing with persistent yellow or mustard algae who want an easy-to-dose, industry-proven algaecide. This 4-pack of 2 lb containers is ideal for multi-pool service businesses, seasonal stocking, or households that prefer having backup treatment on hand. Always follow label directions and safety guidance when handling and applying chemical treatments.