The reduction in pH value depends on the water hardness. With high water hardness, it is more difficult to lower the pH value and more pH reducer is required. Therefore, no general dosing quantities can be specified.

The hardness of tap water varies from region to region. To ensure the smooth maintenance of your whirlpool, it is important to know your water hardness. Your regional water supplier can provide you with this information. Water hardness is measured in degrees of German hardness (°dH).

Water hardness in the United Kingdom

• Below 8 °dH – soft water
• 8 °dH – 14 °dH – medium water
• Above 14 °dH – hard water

Important: If your water is harder than 14 °dH, you should use Lotus Clean pH-Minus Granulate.

Optimal pH value

The pH value should be between 6.8 and a maximum of 7.2.

In the first few days or weeks, the pH value often rises again as carbon dioxide escapes from the water. You should therefore measure the pH value regularly – daily in the early stages – and lower it if necessary.

Application

• First measure the pH value of the water.
• Add approx. 50 ml of pH reducer per 1,000 litres of water in the whirlpool.
• Leave the pumps running until the product is completely mixed in.
• Measure the pH value again after about 5 minutes.
• Use the difference to determine whether and how much pH reducer still needs to be added.