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Onzen Technical Guide
1.12.5 Using Sodium Chloride Test Strips
The following steps provide guidance to help ensure sodium chloride test strips are used correctly.
Steps to Help Ensure Sodium Chloride Test Strips are Used Correctly
Step 1. Take Water Sample
Take a sample of water from the spa in a small cup
(about 25mm / 1” full).
NOTE: Always take water samples 25-30cm (12”-18”) below
the water surface.
Step 2. Place Test Strip in Water Sample
Place the lower end of the strip into the water.
IMPORTANT Keep top half of strip COMPLETELY dry to get
an accurate reading.
Step 3. Test Duration Period
Leave strip in water for 3 – 5 minutes until yellow band
at top of strip turns dark.
Step 4. Obtain Readings
Obtain your reading: where top of white peak falls on
the number scale.
Read top of peak to the nearest 0.2 division.
Step 5. Correspond Test Result Reading
Correspond the test result reading number with the
numbers on the bottle.
