In The Swim Algaecide
Best high-potency algaecide for pool owners managing well water and stains.
This high-potency formula is the heavy-duty solution for stubborn algae, especially in well-water pools prone to staining. It trades the lower cost of standard treatments for a non-foaming, professional-grade strength that keeps your water clear without the usual chemical headaches.
Who it's for
- Pool owners battling stubborn or recurring algae outbreaks
- Homeowners protective of delicate pool finishes and surfaces
- Busy pool managers seeking low-maintenance, long-term prevention
Who should skip it
- Budget-conscious shoppers prioritizing lower upfront costs
- Novice pool owners uncomfortable with precise chemical measurements
- Users dealing with deep-seated, established black algae colonies
Performance breakdown
Algae eradication potency
The 60% polyquat formula aggressively neutralizes even the most stubborn algae blooms.
Water chemistry compatibility
pH-tolerant design ensures consistent performance across diverse pool water conditions.
Well water performance
Specialized non-metallic composition effectively prevents unsightly rust staining from well sources.
Application convenience
Non-foaming liquid formula allows for quick, mess-free dosing without pool disruption.
Treatment longevity
High concentration levels provide extended protection that outlasts standard market alternatives.
System versatility
Highly effective for standard pools, though incompatible with saltwater filtration systems.
Key Specs
Active Ingredient
60% polyquat
Chemical Form
Polymer-based liquid algaecide
Container Size
1 qt.
Product Weight
2.495 lbs.
Initial Dosage
6-11 oz. per 10,000 gallons
Maintenance Dosage
2-4 oz. per 10,000 gallons
Pool Surface Compatibility
Non-staining
Product Dimensions
3.2 inches W x 9.4 inches L x 3.3 inches H
Treatment Capacity
160,000 gallons
Chemical Purpose
Algaecide
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