Water hardness & pH value

Why should you pay attention to the water hardness in a whirlpool?

If the water hardness is high, lime precipitation can occur in the whirlpool and this can lead to clouding and biofilms in the pipes. Therefore, measures to control the water hardness are very important.

Short overview

  • Water has different hardnesses. The harder the water the easier it is for limestone to form.
  • Limestone settles in the pipes and causes biofilm.
  • Limestone can lead to turbid water and clog the filters.
  • You can ask your water supplier for the water hardness or measure it with our total hardness test kit.

Measures against water hardness and lime precipitation

Soft water 0 to 9 °dH

  • Adjust pH value to 6.8 to 7.2
  • Add Calcium Ex to the water

Average hardness 10 to 13 °dH

  • Adjust pH value to 6.8 to 7.2
  • Add Calcium Ex to the water
  • If necessary soften the water with Calc Down Pads

Hard water from 14° dH

  • Adjust pH value to 6.8 to 7.2
  • Add Calcium Ex to the water
  • Soften the water with Calc Down Pads
  • As long as the pH value is still rising, only add Lotus Clean Shock to the water. Permanently 0.5 to 1 mg/l shock content in the water. Adjust water hardness and pH value in the whirlpool. Add Lotus Clean Basic only 25% of the prescribed amount into the water. When the pH value remains stable and no longer increases, switch to normal water care.
  • Every 4 to 6 weeks, lower the pH value to 5.0 for 24 hours and then adjust it back to 6.8 to 7.2.
    (This will remove any lime scale in the pipes)
Water hardness and pH value are in a direct correlation. The harder the water, the harder it is to lower the pH-value and the faster the pH-value rises again.

Water hardness and pH value are two very important parameters for successful water care in the whirlpool.