Natural Chemistry PHOSFREE 3 LIT/.79 GAL - 05121



Model # 05121

By Natural Chemistry

  4.38 Average  



Model # 05121

Product Description

Natural Chemistry PHOSfree 3 Liters - Zero Phosphates, Zero Problems

PhosFree is the only patented product on the market that removes phosphates on the filter. Its easy application into the skimmer will not cloud your water.


  • Reduces phosphate levels to near zero
  • Will not cloud pool water
  • Easy to use, just add to skimmer
  • Non-toxic and will not harm the environment
  • Compatible with all sanitizers and pool surfaces

Dosage:Per 10,000 gallons (38,000L)

Phosphate Level (ppb)  Phosfree 
 300 or less  16oz (0.5L)
600   32oz (1L)
 900 48oz (1.5L)

How to Apply:

  1. If pool has algae, follow dealer instructions to treat
  2. Follow dealer instructions to balance water chemistry
  3. Clean or backwash filter, if necessary
  4. Determine required PHOSfree amount (see above chart)
  5. SHAKE BOTTLE WELL, with filter running add required dose directly to the skimmer -Note: If DE filter pressure rises above normal range, bump filter or if there is no bump option turn filter off for a minimum of 30 seconds. Repeat either procedure until pressure remains in normal range
  6. Run filter 8 hours/day for 1 week or 48 hours continually without backwashing or cleaning
  7. When phosphate levels are below 100ppb, start weekly dose of Pool Perfect+PHOSfree


  • Add 1L (33.9oz) at a time to DE & Cartridge filters to avoid increased filter pressure.
  • It is important to retest phosphate levels after completion of a phosphate treatment.
  • Repeat PHOSfree treatment until phosphates are 100ppb

Features & Benefits:

  • The only patented phosphate remover that works on the filter
  • PHOSfree is formulated from lanthanum (rare earth compounds).
  • Will not cloud pool water

For our complete line of Natural Chemistry Pool & Spa Chemicals

Product Specifications

3 L
Pool Type:

?     Asked on 10/26/2012 by Guest

Do you sell a test for phosphates?

A  Answered on 10/26/2012 by InyoPools Product Specialist Patrick P.

Yes we do. You can find it here.


Est. Repair Time

Less than 1 hr

Tools Needed


Phosphate level was 1000 ppm

Written on 8/19/2019 by Mack

I started adding 4 capfuls of Phosfree to my 30,000 gal gunite each week. After 3 weeks my phosphate level went from 1000 ppm to 200 ppm. This product works.

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Est. Repair Time

Less than 1 hr

Tools Needed


Cloudy and Phosphate filled pool upon opening

Written on 6/13/2019 by Guest

Upon opening the pool this year, the weather was not conducive to jumping in. We turned the heater on but left the winter cover on also to help jump start the heating process...wrong idea.

The lack of sun and the few leaves that made their way in over the winter made a mess. There were fuzzy balls of phosphates, very cloudy water, and the filter was almost like a pudding of slime. Added the PHOSFREE (double dose), and cleaned the filter.

Did this again in two days, coupled with super shocking the pool. Did the same thing again in two days. Now the pool is back to its normal regimen of weekly adding the PHOSFREE to keep it crystal clear!!

Thank you PHOSFREE

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Review Summary

 (Average 4.38  out of 5 stars)
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