@Daniel Karwalski @Gunther ...

Published June 2, 2017 07:04 by Shandor Cylvan, Mr.

@Daniel Karwalski @Gunther Johne @Engr. Mansoor Ahmed PhD. Scholar thank you for your input. The incoming TDS is between 650-700ppm. Unfortunately NF does not get me down to my required TDS of 80-120ppm. Using RO membranes with permeate blending I can only reach a projected 25ppm as CaCO3 (1.5 dH) Hardness before exceeding the required TDS, the pH would be in the region of 5.6SU at this stage. The required permeate flow rate is 20m3/hr.

If possible, could you expand on the benefits and negatives of dosing Ca(OH)2 versus CaCl2?