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03-09-2011, 12:36 PM
Originally Posted by Jstadler
...... was wondering if a RODI will take the hardness out of my water.....
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Yes, the use of RODI will remove the minerals that make water hard (ie calcium, magnesium, iron, etc.) through use of a water permeable membrane (RO) and ion exchange (DI) process. A measurement of this process is by a TDS meter that will measure the Total Dissolved Solids in the output RODI water. This TDS measurement is non-specific and will measure all
solids that are dissolved in the water, not just the minerals that cause hardness like calcium or magnesium. So if the efficiency of the RODI unit is getting bad because the membranes & ion exchange media needs changing, you will see the TDS measurements increasing from the norm.
Mixing a 15 dKH alk tank water with a higher 20 dKH alk change water will increase
the total tank alkalinity. This increase will depend on the amounts of each that have been mixed together. You can reduce a high alk situation a couple ways: add low alk change water from a functioning RODI unit; or, if dosing, just dose calcium supplement and not the alk for a week and remeasure.
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