Chelant Treatment

EDTA dosage requirements and variations will be similar to phosphate in that there is a reaction and residual portion to the dosage calculation:

(Feedwater hardness) x (3.8) % active / 100 + ppm EDTA desired residual / (feedwater cycles) x % active / 100 = ppm EDTA Product 

Economical control would again be very difficult with fluctuations in feedwater hardness.

Looking at the spreadsheet at the end of the paper shows that the EDTA dosage demand can easily increase twenty-fold with poor feedwater hardness control. Phosphate treatment would be easier to control with variations in feedwater hardness. 
 

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