HASA Phos Out Plus 78121 Concentrated Pool Phosphate Remover – 1 Qt

High-Strength Phosphate Removal for Problem Pool Water

• Service-grade concentrated phosphate remover for swimming pools.
• One 1-quart bottle can remove up to 10,000 ppb of phosphates from 10,000 gallons of pool water.
• Targets phosphates introduced by fertilizers, cleaners, pool chemicals, and other pollutants.
• Useful when elevated phosphate levels are contributing to difficult water-care conditions or persistent algae pressure.
• Exact HASA manufacturer part number 78121 in a 1-quart liquid bottle.

Quick Product Summary

HASA Phos Out Plus 78121 is a concentrated, service-grade phosphate remover designed for swimming pools with elevated phosphate levels. Phosphates can enter pool water from lawn fertilizer, cleaning products, other pool chemicals, environmental debris, and additional pollutants. Because phosphates can act as a nutrient source for algae, lowering excessive phosphate levels can make an overall pool-maintenance program easier to manage.

This 1-quart formula is substantially concentrated for high-phosphate treatment. HASA states that one quart can remove up to 10,000 parts per billion of phosphates from 10,000 gallons of pool water. That makes Phos Out Plus especially useful when a routine maintenance-strength phosphate remover would require a much larger dose.

Phos Out Plus is a liquid treatment and should be dosed according to the current product label using the pool’s actual volume and measured phosphate level. Temporary cloudiness can occur as phosphate is removed from solution and captured for filtration. Maintain effective circulation and filtration during treatment and clean or backwash the filter as needed.

Best For

Swimming pools with confirmed elevated phosphate levels, especially when phosphate contamination from fertilizers, cleaners, chemicals, or environmental sources is contributing to recurring water-care problems.

Why This Matters

• Phosphate control reduces a major nutrient source that can support algae growth.
• The concentrated Plus formula is designed for larger phosphate reductions without requiring multiple bottles of a lower-strength treatment.
• Removing excess phosphate can support a more manageable sanitation and algae-prevention program.
• Liquid application makes it straightforward to distribute treatment through circulating pool water.

Use This When

• A reliable phosphate test shows elevated phosphate levels.
• Phosphates have entered the pool from fertilizer, cleaners, pool chemicals, runoff, or environmental contamination.
• You need a concentrated treatment rather than a maintenance-strength phosphate remover.
• You are troubleshooting recurring algae pressure even though normal sanitizer and water-balance practices are being maintained.

Product Specifications

Application / Compatibility Notes

Phos Out Plus is intended for swimming-pool water treatment. Determine the current phosphate concentration with a suitable pool phosphate test before treatment, then follow the dosage instructions on the current HASA label for the measured level and pool volume. Do not estimate pool volume or treatment amount when accurate testing is available.

Phosphate remover is not a substitute for sanitizer, circulation, filtration, or correct water balance. If algae is already present, address the active algae problem with the appropriate sanitation and cleaning process in addition to phosphate control.

How to Use

Test the pool’s phosphate level and confirm the pool volume before treatment. With the circulation system operating, apply Phos Out Plus according to the current HASA product label for the measured phosphate concentration. Distribute the product as directed and allow the filtration system to remove the precipitated material from the water.

Temporary cloudiness can occur during phosphate removal. Monitor filter pressure and clean or backwash the filter when required. Retest phosphate levels after the treatment and filtration period specified on the current label before deciding whether additional product is needed. Always read and follow the container label and current Safety Data Sheet before handling or applying pool chemicals.

Buy with Confidence

Benchmark Pool Supply helps customers select pool chemicals by exact product, concentration, container size, and treatment purpose. For phosphate treatment, testing first is important: knowing the actual phosphate level and pool volume helps avoid unnecessary chemical use and makes it easier to choose between maintenance-strength and high-strength phosphate removers.

Frequently Asked Questions

How strong is HASA Phos Out Plus?

HASA states that one quart of Phos Out Plus can remove up to 10,000 ppb of phosphates from 10,000 gallons of pool water.

What causes phosphates to enter a swimming pool?

HASA identifies sources including fertilizers, cleaners, pool chemicals, and other pollutants. Environmental debris and runoff can also contribute to phosphate contamination.

Does Phos Out Plus replace chlorine or other sanitizer?

No. Phos Out Plus removes phosphates. It does not replace normal sanitation, circulation, filtration, brushing, or proper water balance.

Can the water become cloudy after using a phosphate remover?

Yes. Temporary cloudiness can occur as phosphate is removed from solution and captured by the filtration system.

How much Phos Out Plus should I add?

Test the phosphate level and determine the pool volume, then follow the current HASA label dosage for those conditions. Do not guess the treatment amount when an accurate test result is available.