88. Establishing Correct Water Chemistry - Arctic Spas

1.11.3 Establishing Correct Water Chemistry

The following steps provide guidance to help establish correct chemically balanced water.

To help ensure chemicals dissolve appropriately it is good practice to first mix/dissolve the chemical in an uncontaminated container of hot water before carefully adding to the spa water.
Steps to Establish Chemically Balanced Water With Onzen

Step 1. Test and Adjust Calcium / Total Alkalinity

(a) Test Calcium hardness. Level should be between 50-150 ppm. If high, lower with a stain & scale controller such as Arctic Pure, Best Defence, to help hold the Calcium in suspension.
NOTE: Salt systems perform best with Low Calcium levels.

(b) Test Total Alkalinity. It should be 80 – 100 ppm (100 max). If high, lower Total Alkalinity with Arctic Pure, Adjust Down (pH Down) or muriatic acid. Do not raise Total Alkalinity!

WARNING: Skipping these steps on Start-up can cause scaling problems and cloudy water that may not be covered under warranty.

NOTE: Use all products according to directions on the bottle.

Step 2. Test and Adjust pH


Test pH. Levels should be between 7.2 – 7.6.

If pH is high, (over 7.6) add Arctic Pure, Adjust Down. If pH is low, (under 7.2) add Arctic Pure, Adjust Up.

NOTE: Use all products according to directions on the bottle. NOTE:
Salt systems naturally drive pH levels to increase, strive to
achieve a Balanced pH level.
NOTE: High pH will cause calcium to precipitate (fall out of
suspension). The problem with calcium falling out of
suspension is that it collects on the heater and pump, and
shortens their life.

Step 3. Mix Salt Crystals

Dissolve 1/3 of the minimum recommended salt dosage in a 5 Gallon (20 litre) pail of hot water.

Refer Arctic Spas – Onzen Salt Dosage Chart contained in this guide.

The following steps provide guidance to help establish correct chemically balanced water.

To help ensure chemicals dissolve appropriately it is good practice to first mix/dissolve the chemical in an uncontaminated container of hot water before carefully adding to the spa water.
Steps to Establish Chemically Balanced Water With Onzen Continued

Step 4. Add Salt to Spa Water & Test TA / pH


(a) Slowly pour the dissolved salt from the pail into the spa water. (b) Run pumps for 5 minutes to help mix salt blend through.

(c) Wait 1 hour.
(d) Then test and adjust Total Alkalinity level accordingly.
(e) Then test and adjust pH level accordingly.
Refer to steps 3 and 4 for correct TA/pH levels.

Step 5. Repeat Step 3 & 4
Repeat steps 5 and 6, ensuring all sub steps are carried out accordingly.

Step 6. Repeat Step 3 & 4
Repeat steps 5 and 6, ensuring all sub steps are carried out accordingly.

Step 7. Test Sodium Chloride Level

You will now need to test sodium chloride levels.
Refer ‘Using Sodium Chloride Test Strips’ for details.

If sodium chloride levels are low, dissolve 1/2 lb (225 Grams) of salt (using cup provided) into hot water. Pour the dissolved salt into the spa water. Test sodium chloride level.

Repeat until required sodium chloride level is reached:
Minimum Maximum
2000 ppm 2500 ppm

Note: The Arctic Spas Onzen Salt Chart in this guide provides the estimated impact of adding 1⁄2 lb (225 Grams) of salt to your spa.

Note: For start up it is recommended to strive for the minimum salt dosage. Once a Sodium Chloride reading has been taken and the minimum salt dosage achieved, it can be increased slightly to accommodate spa usage and bather load, if increasing the Onzen run time does not adequately increase the Chlorine Residual. Having the minimum amount of salt concentration unless the Onzen system is unable to maintain the proper Chlorine Residual, will reduce potential corrosion and increase the life of the Onzen Output Electrode.