Traditional EDTA chelates have sodium as the “counter ion” whereas Solufeed Sodium Free EDTA chelates are not – they are based on potassium (K) or ammonium (NH4) counter ions. Although sodium (Na) is a so-called functional element for many plants, excess sodium can be problematic. Very high levels can be directly toxic while more moderate levels reduce the ability for plant roots to absorb water leading to stress. Sodium also influences soil physics and is responsible for ‘slumping’ where in severe cases the open, healthy soil structure is effectively destroyed.

The amount of sodium applied to soil by the use of most fertilizers is extremely small and has insignificant consequences in normal agricultural situations. However, there is some concern being shown especially in areas where saline and sodic soils are present. A trend towards reducing the sodium content of fertilizers is therefore being seen. In modern closed hydroponics systems great care is needed to ensure that the circulating nutrient solution remains balanced. Sodium is an element that can build up to harmful levels, and again selecting low sodium or sodium free nutrient sources can be advantageous.

Solufeed Sodium Free EDTA chelates are new EDTA formulations of copper, iron, manganese and zinc. A reformulated Solufeed Sodium Free TEC™, a balanced mixture of all six micronutrients is also available. These are companion products to other Solufeed chelates.


Can replace traditional sodium based Fe EDTA products in all applications.

As an efficient iron source in hydroponics and fertigation particularly those where excess sodium is an issue. Such as in recirculating systems and sodic or saline soils.

Useful where high solubility is required such as creating stock tank solutions.


  • Sodium free formulation so ideal for situations where sodium levels in the soil or feed solution are an agronomic issue.
  • High solubility for the confident preparation of concentrated stock solutions.
  • Supplied as free flowing, dustless spray agglomerated microgranules for ease of use.
  • Contains 13% water soluble iron, high analysis for lower rates of use.
  • Compatible with soluble phosphates thereby remaining effective in hydroponics and liquid feed systems.


A microgranular formulation of ferric potassium ethylenediamine tetraacetic acid (FeKEDTA) containing: Water soluble Fe: 13.0 % Fe chelated by EDTA: 13.0 %

Practical pH stability range: 4.0 – 6.5 in aqueous solution.

Pack Size

10 x 1 kg and 25 kg cartons.
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Kalifer Technical Data Sheet

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