Stain Free™ Extra Strength 1.75lb
Product Overview
What pool techs reach for when stubborn surface staining demands a targeted, phosphate-free treatment.
Formulated by Natural Chemistry, Stain Free™ Extra Strength is a premium stain fighter that contains 100% ascorbic acid. Packaged in a convenient 1.75lb (1.75 LBS) container, this high-purity formula safely lifts surface discoloration without adding unwanted phosphate to your pool water. It provides an effective, surface-safe solution across plaster, vinyl, and fiberglass finishes.
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Benefits & What Makes It Different
100% ASCORBIC Acid Formula
Utilizes pure ASCORBIC Acid to quickly lift stubborn surface staining across all pool finishes.
Zero Phosphate Impact
Lifts tough discoloration cleanly without contributing any phosphate that could feed algae growth.
Concentrated 1.75 LBS Size
The 1.75lb bottle delivers commercial-grade strength sized right for standard residential pool treatments.
Product Details
ASCORBIC Acid 100%
0.75 to 1.5 lbs per 10,000 gallons
Compatibility
- Compatible with plaster, vinyl, fiberglass, and painted surfaces
- Do not add directly with chlorine shock; lower sanitizer levels prior to application
When To Use This
Pro Tip
Always drop your free chlorine below 1 ppm before dosing; high chlorine levels will oxidize and consume the ascorbic acid immediately rather than letting it dissolve the stain.
Common Questions & Instructions
How do I apply Stain Free Extra Strength 1.75lb to pool stains?
Lower free chlorine to 0–1 ppm, adjust pH to 7.2–7.6 and total alkalinity to 80–120 ppm, then broadcast 0.75 to 1.5 lbs per 10,000 gallons around the perimeter with the pump running.
Does Stain Free Extra Strength add any phosphate to the pool?
No, this formula is entirely free of phosphate, ensuring you treat stubborn surface stains without complicating water balance or promoting algae.
When is it safe to swim after adding Stain Free Extra Strength?
Wait at least 1 to 2 hours with the circulation system running, and ensure your pH is between 7.2–7.6 and free chlorine is balanced before swimming.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
