This unstable reaction can be stabilised by taking one of the following measures, or a
combination thereof:
• Add disinfected drain water, which typically contains bicarbonate, to the supply water
(via an EC pre-control).
• Add a small amount of drinking water or spring water (1 – 2%) to the supply water by
means of an electric valve with a low flow rate.
• Add a small quantity of bicarbonate to one of the fertiliser solutions. This can be done,
for example, by replacing 1% of caustic potash with an equal quantity of potassium
carbonate (KHCO
3
) or calcium carbonate (K
2
CO
3
).
Supply water with too high a concentration of bicarbonate:
In many cases, too high a concentration of HCO
3
-
(≥ 1.0 mmol/l) may be deemed to exist in the
supply water when using well water, river water or drinking water. Dosing acid may then result in
there being insufficient time to neutralise the bicarbonate.
Stabilisation is possible by pre-treating the supply water using a Priva Neutralizer with an
acid injection and aeration system. The treated supply water is then stored in a stock tank.
41NutriJet - user - 00.002
Appendices
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