AF Additor

Potent pH corrector and regulator

AF Additor is an effective pH corrector and regulator that buffers tap-water to improve compatibility. It ensures pesticides are less impeded by water quality (alkaline, hard, or brackish) or contaminated with insoluble deposits. Most fertilisers and pesticides are negatively charged and therefore sensitive to water hardness, this is caused by the presence of Calcium and Magnesium bicarbonates in hard waters. AF Additor neutralises specific cations, leaving the active ingredients completely free and ready to perform.

Available pack sizes
20L, 200L, 600L, 1000L

Proprietary combination of organic and inorganic acids.

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The benefits

  • A unique blend of materials that are effective in improving foliar sprays.
  • Lowers and buffers pH of solution and improves compatibility.
  • Not nutrient based, reducing the risk of potential tank mixing issues.
  • A sequestering agent that isolates cationic contaminants.
  • Helps prevent the degradation of certain pesticides.
  • Contains complexing acidifiers that reduces pH.
  • Active ingredients are natural plant growth promoters.
  • Extremely cost effective.

The importance of a pH regulator

Water is the primary carrier for applying crop protection products and constitutes more than 95% of the spray volume. Water quality can be affected by both hardness and pH, but the effects are quite distinct.

For most of the UK, hard water is the primary issue. Reservoir and ground water nearly always have something dissolved in them, such as carbonates, bicarbonates, sulphates, or nitrates. These affect the pH and hardness. Glyphosate is a prime example of where performance can be impaired by hard water, it is highly soluble, it’s an excellent chelating agent, which is where the chemical compounds react with metal ions to form a stable, water soluble complex. When added to hard water, the chelates in glyphosate bind with the cations to become locked up which makes them unavailable.

With most herbicides, the solution is to add a cation-complexing agent. Uncorrected, hard water can reduce the efficacy of certain herbicides by up to 30%.

The pH of the water is a different issue, but one that needs consideration to maximise herbicide performance. In some situations, the pH of water may be too high to fully support the herbicide, because drinking water regulations specify that water at the tap should be between pH 6.5-9.5. In most cases, water leaving a treatment works is between pH 7-8, but it can change as it passes through the network of reservoirs and pipes.

Even at the lowest allowable pH for tap water of pH 6.5, the pH is still too high for most post-emergence herbicides. Many are classified as weak acids, so work best at a pH in the range pH 3-6. Above pH 7, certain pesticides can be affected by a process known as alkaline hydrolysis and this renders them permanently inactive.

Application method

IMPORTANT: This information is approved as part of the product label. All instructions within this section must be read carefully in order to obtain safe and successful use of this product.

AF ADDITOR is a water conditioning product and thus should be treated at such.

Shake the container well before opening and use. Spray equipment should always be clean before adding product.

COMPATIBILITY: Compatible with a wide range of agrochemical products. For details of compatibilities contact your distributor or local AIVA FERTILISER representative. Carry out a jar test before adding to a new mix.


MIXING: Always add AF ADDITOR to the spray water before adding agrochemicals or fertilisers. Always add 1 litre per 100 litres of wash water. Always be sure to check samples of water regularly as pH of water sources can vary over time.

TANK MIX: 1) Spray water 2) AF ADDITOR 3) Agrochemicals or fertilisers

HARD WATER DOSE RATE: 175ml + per 100L

Developed using the Flex Fertilizer System

Aiva Fertiliser uses Flex Fertilizer System technology where the liquid fertiliser contains nutrients in a form that can be taken up by the leaves and utilised by plants highly efficiently. The nutrient content is put into complex compounds using complex chemistry. This formulation results in nutrients being kept available to the plants for a longer period of time and are not lost to leaching or evaporation to the same extent as traditional fertilisers.