United Chemical Stain Treat, 2 lb | PST-C12
United Chemical
SKU: PST-2LB-C12
United Chemical Pool Stain Treat – 2 lb Bottle (PST-C12)
United Chemical Pool Stain Treat (PST-C12) is a granular stain remover and stain preventative designed to help lift and control common pool surface stains, especially iron (rust/“tea color”) and other mineral/metal staining, as well as some organic discoloration. It works by chelating and sequestering metals in the water to help remove existing staining and reduce re-staining.
Key Features
- Use: Stain removal + ongoing stain prevention
- Targets: Mineral/metal staining (including iron/rust) and many common discoloration issues
- Format: Granular treatment
- Compatible sanitizers: Chlorine, salt systems, and bromine
- Compatible surfaces: White plaster, fiberglass, vinyl (pre-dissolve recommended for colored plaster/painted or specialty finishes)
- Helps keep metals in suspension to reduce re-staining (often effective up to about 60 days depending on conditions)
Dosage Guidelines
- Stain Removal: 2 lb (1 bottle) per 20,000 gallons
- Stain Prevention: 1 lb per 20,000 gallons per month (maintenance dosing where staining conditions persist)
- Spot Treatment: Use a spotting bag/sock placed directly on the stain (monitor closely; do not leave in one place on vinyl or colored finishes without checking)
Application Notes
- Lower free chlorine before treatment (high chlorine can reduce effectiveness).
- Balance pH to the normal operating range (commonly 7.2–7.6).
- For general staining: broadcast the measured dose around the perimeter with the pump running.
- For colored plaster/painted finishes: pre-dissolve granules in a bucket of pool water before adding to help avoid lightening/bleaching.
- After stains lift, bring chlorine back up gradually (avoid immediate heavy shocking that can re-oxidize metals).
Safety & Handling
- Wear gloves and eye protection when handling.
- Avoid contact with skin and eyes; do not ingest.
- Store sealed in a cool, dry location and keep pool chemicals separated.
Related Products
- Stain & Scale Control (Sequestrants)
- Metal Removers
- Pool Water Test Kits
- Pool Brushes
- Filter Cleaners (Cartridge / DE / Sand)
- pH Decreaser / Muriatic Acid Alternatives
Maintenance Tips
- Identify the stain source (well water metals, heater corrosion, mineral-heavy fill water) to reduce repeat staining.
- Keep pH and alkalinity in range and avoid large swings—unstable water can trigger metals to fall out and stain surfaces.
- Run the pump continuously during active stain treatment and clean/backwash the filter as it loads up.
- If metals are a persistent issue, use a monthly prevention dose and consider using a hose pre-filter when filling.
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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