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What is buffered grade coir?

Coir glossary · Updated 2026-09-22

Coir pith that has been washed and then treated with calcium nitrate or calcium chloride to displace bound sodium and potassium. EC after buffering: typically <0.4 mS/cm (1:5 method). Buffered grade is required for professional hydroponic production, especially tomato, pepper and berry crops where sodium and potassium interference with fertigation formulas must be minimized.

Buffered grade: equivalents.

PT: tamponado · ES: tamponado / acondicionado

On Carve’s coir pith specification, EC is measured and reported per lot (1:5 method): Natural grade typically 0.8–1.5 mS/cm; Washed, EC reduced by freshwater washing; Buffered, washed plus calcium and magnesium treatment. The EC limit is fixed in the customer’s contract (source: Carve Coir Pith specification).

Where it appears in a spec or lot report. In a complete coir specification, as the processing/salt level (the “surname”) next to the particle size grade.

Source: Romero · RHP. Definition from the Carve coir glossary, where the full source list is given.

Related terms.

Natural grade: Coir pith with no post-extraction chemical or water treatment. EC of natural coir: typically 0.8–1.5 mS/cm (1:5 method).

Washed grade: Coir pith washed with fresh water to reduce soluble salt content.

Buffering: Chemical treatment of coir pith with a calcium solution — typically calcium nitrate (Ca(NO3)2) or calcium chloride…

See also: Coir pith from Brazil: specification checklist · back to the coir glossary.

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About this page. Part of the coir glossary maintained by Carve Biorrefinaria Agroindustrial Ltda, a coir pith and fiber producer in Paraipaba, Ceará, Brazil. Corrections: [email protected].