Natural Chemistry 05121 Swimming Pool Spa PHOSfree Phosphate Remover - 3 Liters
Natural Chemistry 05121 Swimming Pool Spa PHOSfree Phosphate Remover - 3 Liters
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Natural Chemistry

Natural Chemistry 05121 Swimming Pool Spa PHOSfree Phosphate Remover - 3 Liters

Natural Chemistry 05121 Swimming Pool Spa PHOSfree Phosphate Remover - 3 LitersNatural Chemistry 05121 Swimming Pool Spa PHOSfree Phosphate Remover 3 LitersNatural Chemistry 05221 Spa Swimming Pool PHOSfree Phosphate Remover 2 Liters
Size3L

Key item features

  • Phosphate Elimination: Effectively removes phosphates from swimming pool water, contributing to reduced maintenance and a "No Phosphates - No Problems" approach.
  • Lanthanum Formulation: Utilizes patented PHOSfree technology, formulated with lanthanum (rare earth) compounds, to reduce phosphate levels.
  • Filter Application: Forms a thin coating on filter media when added to the skimmer, allowing phosphates to be reduced as water flows through the filter.
  • Dosage Guidelines: Recommended dosage is 4 oz. per 8,000 gallons for regular use, with higher dosages for excessive phosphate levels and a weekly maintenance dose of 1 cap (4oz) per 8,000 gallons.
  • Application Instructions: Requires cleaning or backwashing the filter, shaking the bottle, adding to the skimmer with the pump running, and filtering continuously for 48 hours.
  • Treatment Limitations: For DE and Cartridge filters, do not add more than 1.5L (48oz) at a time, and clean/backwash the filter between treatments if more is needed.
  • Pre-treatment Conditions: Algae must be treated and chlorine levels must be under 5ppm before testing and lowering phosphates.
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Current price is $28.49
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Arrives by Wed, Jul 29
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Sold and shipped by In The SwimPro Seller
4.386970879615731 stars out of 5, based on 3331 seller reviews(4.4)
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Customer ratings & reviews

4.6 out of 5 stars
stars
342 ratings274 reviews
How item rating is calculated
  1. 5 stars82% (279)
  2. 4 stars8% (27)
  3. 3 stars3% (9)
  4. 2 stars1% (2)
  5. 1 star7% (25)

Reviews summary

Pros

  • : Offers lower prices compared to others.
  • : Simple navigation and operation.
  • : Offers lower prices than other sellers.
  • : Reduces phosphate levels in pool water.
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Showing 1-3 of 274 reviews

Jun 19, 2026
Marsha
Top Reviewer
Item details
Size: 3L
Sold and shipped byIn The Swim
5 out of 5 stars review

Verified Purchase

There are trees around our pool and this product really helps with the phosphates that can build up from natural resources. Works great, easy to use and well priced.

Helpful?2VRDNKI1D00Y41810177
Jul 13, 2026
Steve R.
5 out of 5 stars review

Seller Verified Purchase

Natural Chemistry PHOSfree

I have been using this product for several years and I am satisfied with the results. Phosphorus build up is a problem especially during the hot summer months in Las Vegas.

Review from Doheny's
Helpful?2VRDNKI1D00Y41810177
Jan 12, 2026
ronald
Item details
Size: 3L
Sold and shipped byIn The Swim
5 out of 5 stars review

Verified Purchase

A great pool product!

Phosfree is a great product that rids your pool of phosphates that are enabling algae to continue to grow and survive no matter how much chlorine you use. By following the directions for use, it will rid your pool of algae. I would recommend this product to anyone.

Helpful?2VRDNKI1D00Y41810177