United Chemical Yellow Treat, 2 lb | YT2-2LB-C12
United Chemical
SKU: YT2-2LB-C12
United Chemical Yellow Treat² Mustard Algaecide – 2 lb Bottle (YT2-2LB-C12 / YT2-C12)
United Chemical Yellow Treat² is a fast-acting mustard (yellow) algae treatment designed to knock down stubborn yellow blooms in all pool surface types. This granular treatment is commonly used as a “rescue” or “problem algae” step alongside super-chlorination to help clear visible mustard algae quickly and restore water clarity.
Key Features
- Targets mustard/yellow algae (a common, chlorine-resistant algae type)
- Granular sodium bromide-based algae treatment (used with super-chlorination)
- Surface-safe for plaster, vinyl, and fiberglass finishes
- Non-staining formula (no copper or staining metals)
- Compatible with chlorine pools (including salt systems) and bromine pools
Product Details
- Brand: United Chemical
- Product: Yellow Treat² Mustard Algicide
- Form: Granular
- Size: 2 lb bottle
- Part / SKU: YT2-2LB-C12 (commonly referenced as YT2-C12)
- Primary Use: Eliminate visible mustard/yellow algae blooms
Dosage & Directions (Quick Guide)
- Swimming Pools: Add 5 oz per 10,000 gallons by broadcasting over the water surface.
- Spas: Add 1/4 oz per 500 gallons by broadcasting over the water surface.
- Brush affected areas thoroughly (walls, floor, steps, ladders, and behind fittings).
- Immediately super-chlorinate using your preferred chlorine shock (follow the shock product’s label for dosage).
- Run circulation and filtration continuously during treatment and clean/backwash the filter as needed.
Best Practices for Mustard Algae
- Brush aggressively and don’t skip “hidden” areas (skimmers, behind lights, under rails, steps, toys, and vacuum hoses).
- Clean or replace filter media if it’s heavily loaded with algae and debris.
- After clearing the bloom, maintain consistent sanitizer levels and brush weekly to reduce recurrence.
Related Products
- Pool Shock (Liquid or Granular)
- Pool Algaecides (Maintenance / Preventative)
- Pool Brushes (Wall & Tile)
- Chlorine Test Kits & Test Strips
- Filter Cleaners (Cartridge / DE / Sand)
- Pool Clarifiers
Maintenance Tips
- Always confirm your pool volume so you can dose accurately.
- For algae events, keep the pump running and clean the filter more often until water is fully clear.
- Maintain balanced water chemistry (especially free chlorine, pH, and stabilizer) to reduce algae regrowth.
- Store tightly closed in a cool, dry place and keep pool chemicals separated to prevent cross-contamination.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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