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A
Hardness testing
• Test your water hardness with the Total Hardness Test Kit, as described below, to determine
the expected cartridge lifespan.
• Ensure the Scale Control Plus is working optimally by comparing the water hardness of the
cold mains water to the hardness of the Quooker tank water. The second value should be
lower.
1. Filling test tube
Take the test tube out of its box. Take
a sample of water from the mains cold
water feed. Rinse out the test bottle with
this sample water then fill to the 5 ml mark.
2. Adding reagent
Slowly add the reagent drop by drop, all
the while swirling gently to mix the water.
Count the number of drops it takes to turn
the red colour of the solution to green.
3. Determining water hardness
One drop of the reagent is the equivalent
to 1.0°dH (degree of hardness) – For
example, if it takes 9 drops for the sample
to turn to green, this means your water has
a water hardness of 9°dH.
+ + … = °dH
10
15
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25
30
ml
5
10
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30
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5
10
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25
30
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5
