Graf oneAdvanced Operation Manual page 85

9.3.3.2 Precipitant
The choice of precipitant depends on availability, pH value, water hardness, concentration of the
active ingredient, shelf life, thermal stability, and other factors. Please bear in mind that all of
these agents are declared hazardous substances!
There are a number of precipitants available for phosphorus. The most common of these are:
polyaluminium chloride (PAC)
iron(III) chloride (FeCl
sodium aluminate
9.3.3.3 Set dosing
The correct dosage of precipitant depends on several factors, e.g. the quantity of dissolved
phosphate, the targeted cleaning level, the precipitant used, etc.
During commissioning, the runtime per cycle can be preset according to the values in the table
below. We recommend during maintenance to measure the P content in the discharge and to
adjust the dosage by adjusting the runtime.
9. Additional controller functions
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3
WARNING
Highly corrosive and harmful substances
The precipitant sodium aluminate causes serious chemical
burns. This may result in serious injury and damage to eyes.
The precipitants iron(III) chloride and polyaluminium chloride
are harmful to health. There is a danger of severe irritation to
skin and eyes. Ingestion can be harmful to health.
Wear goggles, protective gloves, and protective clothing.
Consult the safety data sheet provided by the manufacturer.
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