The water in the whirlpool became milky when pH-Plus granules were added. What is the cause of this?
The pH-Plus granulate raises the pH value. If you add the powder to the whirlpool water, it can happen that the water reaches very high pH values due to immediate contact with the powder. At high pH values - basically above 7.0 - the lime dissolved in the water can chemically transform and form limestone. This is exactly what happens. The limestone causes this milky colouring of the water.
This chemical process also works in reverse. If you lower the pH below 7.0, the limestone is dissolved in the water again. The lower the pH value, the faster this process is. Therefore, it is recommended to lower the pH to 5.5 to 6.0.
To avoid clouding when raising the pH value, you should take a bucket of water from the whirlpool and slowly dissolve the pH-Plus powder in it. When it remains clear in the bucket, pour the contents into the whirlpool very slowly while running the pumps at full strength so that the water mixes quickly and locally the pH value does not rise so much.