TL;DR: The Applied Biochemists Wintertrine Algaecide Cleanser (1/2 gallon) provides concentrated winterizing algaecide protection for pools up to 20,000 gallons. Application requires balancing water chemistry (pH 7.4 to 7.6, alkalinity 80 to 120 ppm), calculating proper dosage (8 ounces per 10,000 gallons), adding product with pump running, circulating for 24 hours, shocking pool, and completing winterization. The product costs $25 to $40 and prevents algae growth for 3 to 6 months ensuring easy spring opening.
SEO Summary: Comprehensive 2026 guide to using Applied Biochemists Wintertrine Algaecide covering product benefits, pre application water balancing, dosage calculation, application procedures, circulation requirements, shock treatment timing, and complete winterization steps for pools up to 20,000 gallons.
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Understanding Applied Biochemists Wintertrine
The Applied Biochemists Wintertrine Algaecide Cleanser (1/2 gallon) is a concentrated winterizing algaecide specifically formulated for pool closing. Applied Biochemists, a trusted name in pool care for over 40 years, designed Wintertrine to provide extended algae protection during winter dormancy while also cleaning pool surfaces. The dual action formula prevents algae spore germination for 3 to 6 months and removes organic buildup, ensuring pools open in spring with clear water and clean surfaces.
What Makes Wintertrine Unique
Wintertrine differs from standard maintenance algaecides through its concentrated formula providing 3 to 6 months protection versus 1 to 2 weeks for maintenance products, dual action cleaning that removes oils, lotions, and organic films while preventing algae, compatibility with all pool types (vinyl, fiberglass, concrete) and sanitizer systems (chlorine, bromine, salt water), and non foaming formula that will not create foam or cloudiness. The 1/2 gallon bottle treats pools up to 20,000 gallons making it ideal for most residential pools.
Benefits of Using Wintertrine
Wintertrine provides several advantages for pool winterization including preventing green, black, and mustard algae growth during dormancy, cleaning pool surfaces by removing organic films and buildup, reducing spring opening cleanup time and chemical costs by 50 to 75 percent, protecting pool surfaces from staining and discoloration, and ensuring crystal clear water when pools are reopened. The product costs $25 to $40 and prevents spring cleanup costs of $200 to $500.
Step 1: Test and Balance Water Chemistry
Proper water chemistry before adding Wintertrine ensures maximum effectiveness and optimal algae prevention.
Complete Water Testing
Test all water chemistry parameters using a quality test kit like the Taylor K-2005 Complete Test Kit. Test pH (target 7.4 to 7.6 before winterization), total alkalinity (target 80 to 120 ppm), calcium hardness (target 200 to 400 ppm for concrete pools, 150 to 250 ppm for vinyl pools), and current chlorine level (should be 1 to 3 ppm before adding winterizing chemicals). Record all results to track adjustments needed and document pre winter chemistry.
Adjust Total Alkalinity First
Balance total alkalinity to 80 to 120 ppm before adjusting other parameters. Alkalinity buffers pH and prevents rapid pH swings during winter. Add alkalinity increaser (sodium bicarbonate) if levels are low. If alkalinity is high, lower it by adding muriatic acid or pH decreaser in small increments. For a 20,000 gallon pool, expect to use 2 to 4 pounds of alkalinity increaser per 10 ppm increase needed. Allow 4 to 6 hours circulation between adjustments and retest to confirm proper levels.
Adjust pH to Optimal Range
After alkalinity is balanced, adjust pH to 7.4 to 7.6. This range prevents corrosion (low pH) and scaling (high pH) during winter dormancy and ensures Wintertrine works effectively. Add pH increaser (soda ash) if pH is below 7.4, or pH decreaser (dry acid) if above 7.6. For a 20,000 gallon pool, expect to use 1 to 2 pounds of pH increaser or decreaser per 0.2 pH unit adjustment. Make small adjustments, circulate for 4 to 6 hours, and retest before making additional changes.
Step 2: Calculate Proper Dosage
Accurate dosage calculation ensures optimal algae prevention without product waste or under treatment.
Standard Dosage Guidelines
Applied Biochemists Wintertrine uses a dosage of 8 ounces per 10,000 gallons of pool water. The 1/2 gallon (64 ounce) bottle treats up to 80,000 gallons at minimum dose or 20,000 gallons at maximum winterizing dose. For most residential pools, use the full bottle for pools up to 20,000 gallons to ensure adequate protection through 3 to 6 months of winter dormancy.
Dosage by Pool Size
For pools 10,000 gallons or smaller, use 32 ounces (half the bottle) for adequate winterizing protection. For pools 10,000 to 15,000 gallons, use 48 ounces (three quarters of the bottle). For pools 15,000 to 20,000 gallons, use the entire 64 ounce bottle. For pools over 20,000 gallons, use multiple bottles or larger sizes like Applied Biochemists Wintertrine 4 Pack.
Step 3: Add Wintertrine Algaecide
Proper application ensures even distribution and maximum effectiveness throughout the pool.
Application Method
With the pool pump running, pour the measured Wintertrine dose slowly around the pool perimeter. Walk around the pool distributing the product evenly to all areas. Pour near return jets to help distribute the product quickly. For pools with deep ends or multiple levels, pour extra product in those areas to ensure adequate coverage. Never pour the entire dose in one location as this creates concentrated areas that may stain surfaces.
Timing Considerations
Add Wintertrine when water temperature is below 65°F but above freezing (32°F). This temperature range ensures algae are dormant but the product can still circulate and distribute properly. Add Wintertrine in late afternoon or evening to allow overnight circulation before completing winterization the next day. Avoid adding during rain or high winds that could dilute or blow the product.
Step 4: Circulate for 24 Hours
Proper circulation distributes Wintertrine throughout the pool ensuring complete protection.
Circulation Requirements
Run the pool pump continuously for 24 hours after adding Wintertrine. This ensures the product reaches all areas of the pool including corners, steps, benches, and deep areas. Set pump to normal filtration speed (not low speed if you have a variable speed pump). Check pump operation periodically to ensure it continues running. If pump stops, restart it immediately and extend circulation time to compensate.
Verification of Distribution
After 24 hours circulation, the water should appear clear with no visible product concentration or cloudiness. If you see concentrated areas or cloudiness, continue circulation for another 12 to 24 hours. Proper distribution ensures all pool surfaces receive algae protection and prevents localized staining or inadequate protection in some areas.
Step 5: Shock Pool After Circulation
Shocking the pool after Wintertrine circulation eliminates remaining bacteria and organic contaminants ensuring complete winterization.
Why Shock After Wintertrine
Wintertrine prevents algae growth but does not eliminate existing bacteria or oxidize organic contaminants. Shocking provides this additional treatment creating a completely sanitized pool before winter. The combination of Wintertrine and shock provides comprehensive protection against all biological growth during dormancy.
Shock Product Selection
Use quality shock products like Leslie's Fresh N Clear Chlorine Free Pool Shock, Pool Breeze Power 73 Shock Treatment, or Pool Essentials Shock Treatment 6 Pack. For pools with mustard algae concerns, use Yellow Out Swimming Pool Chlorine Shock Enhancing Treatment.
Shock Application
Calculate shock dosage based on pool size (typically 1 pound per 10,000 gallons for winterizing). Dissolve shock in a bucket of water before adding to pool to prevent bleaching of vinyl liners. Pour dissolved shock around pool perimeter with pump running. Circulate for 8 to 12 hours after shocking. Test chlorine level after circulation (should be 1 to 3 ppm before completing winterization).
Step 6: Complete Winterization
After Wintertrine and shock treatment, complete remaining winterization steps to fully protect your pool.
Lower Water Level
Lower water to 4 to 6 inches below skimmer opening for in ground pools or per manufacturer specifications for above ground pools. Use a submersible pump for efficient water removal. This prevents water from entering skimmer and return lines where it could freeze and cause damage.
Winterize Plumbing
Blow out all plumbing lines using a shop vacuum or air compressor. Install winterizing plugs like winterizing test plugs in all lines. Add pool antifreeze to lines that cannot be completely drained. For above ground pools, install air pillows like the 4 foot winterizing air pillow.
Install Pool Cover
Install a quality winter cover to protect from debris and weather. Secure covers properly using water bags or safety cover springs. For additional protection, use cover pumps like the Coverblast Pool Winter Cover Pump Attachment to remove accumulated water.
Conclusion
Using Applied Biochemists Wintertrine Algaecide Cleanser is an essential step in proper pool winterization. By following these six steps (balancing water chemistry, calculating proper dosage, adding Wintertrine with pump running, circulating for 24 hours, shocking the pool, and completing winterization), you ensure your pool receives comprehensive algae protection for 3 to 6 months of winter dormancy.
The investment in Wintertrine ($25 to $40) prevents spring cleanup costs of $200 to $500 by eliminating algae growth, reducing chemical needs, and ensuring crystal clear water when pools reopen. Pools treated with Wintertrine open faster, require less shocking and brushing, and are ready for swimming within days rather than weeks. The dual action formula not only prevents algae but also cleans pool surfaces, removing organic films and buildup that would otherwise require extensive spring scrubbing.
As you prepare for winter 2026, make Applied Biochemists Wintertrine a core component of your winterization process. Combined with proper water balancing, shock treatment, and complete winterization procedures, Wintertrine ensures your pool survives winter in excellent condition and opens cleanly when warm weather returns. Your commitment to proper winterization with quality products like Wintertrine protects your pool investment and ensures years of swimming enjoyment.
Key Takeaways:
- Wintertrine provides 3 to 6 months algae protection for pools up to 20,000 gallons per 1/2 gallon bottle
- Balance water chemistry (pH 7.4 to 7.6, alkalinity 80 to 120 ppm) before adding Wintertrine
- Use 8 ounces per 10,000 gallons or entire bottle for pools up to 20,000 gallons
- Add Wintertrine with pump running, distributing evenly around pool perimeter
- Circulate for 24 hours to ensure complete distribution throughout the pool
- Shock pool after Wintertrine circulation to eliminate bacteria and organic contaminants
- Complete winterization by lowering water level, winterizing plumbing, and installing cover
- Wintertrine costs $25 to $40 and prevents spring cleanup costs of $200 to $500
- Dual action formula prevents algae and cleans pool surfaces simultaneously
- Pools treated with Wintertrine open faster and require less spring chemical treatment
Protect your pool with quality winterizing products from pool chemicals. Test water accurately with water test kits. Complete winterization with comprehensive maintenance kits and quality pool parts and accessories. Your investment in proper winterization ensures your pool remains protected and ready for enjoyment when swimming season returns in 2026.
