HOW DOES RESIDUAL HARDNESS WORK WITH A WATER SOFTENER?
Many water softener plants have a knob with which the residual hardness of the water can be adjusted. This button is called the cutting valve or the mixing valve. This makes it possible to adjust the water hardness of water that has already been processed by the water softener. The default setting is usually 0 fH, so the water is completely softened. All magnesium and lime has disappeared from the water. However, there may be situations in which a residual hardness offers advantages. You can read about these benefits and why complete water softening is not always the best setting on this page.
WHAT IS THE FUNCTION OF THE MIXING VALVE?
In a water softener that works on the basis of an ion exchanger, the resin cylinder will remove all calcium ions and magnesium ions. As a user you have no choice in this, that is how the descaling process works. If you like to use water with a proportion of calcium and magnesium, untreated tap water will have to be mixed with the purified water. The ratio of this can be adjusted with the mixing valve. This is usually a small button on the system that can be turned. The further the mixing valve is opened, the more untreated water is mixed with the already softened water. This means water with a higher hardness that flows through the pipes of the house.
HOW HARD IS THE WATER?
It is quite difficult to accurately determine the residual hardness of the mixed water, which is also not readable on the device. Because the manufacturer does not know what hardness the water has from the water pipe, they cannot indicate how hard the water will be after mixing. They can indicate in the manual that, for example, a quarter turn is on the button for 10 percent untreated water. If the standard water has an fH value of 14, and is mixed on the basis of 1/10 with purified water with an fH value of 0, the result will therefore be an fH value of 1.4. For an accurate measurement you will have to measure the water that comes out of the tap.
WHY SHOULD YOU USE RESIDUAL HARDNESS?
It is perhaps not immediately clear why you should mix softened water with raw water. Here are a number of situations where residual water hardness can offer benefits:
- Less softening salt is required.
- Soft water has less sodium.
- Small amounts of calcium and magnesium in the water are good for the body.
- The regeneration process will not start as quickly.
- Less flushing water is required
- The risk of leakage in the pipes is reduced.
- Soft water feels less pleasant than hard water.
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