New concentrated one-chem is the only toilet chemical with our clever dosing device, which helps to eliminate wasteful over-dosing – meaning you get more value for money from every bottle.

To pour just the right dose of one-chem, simply:

• Remove the child-proof bottle cap
• Squeeze the one-chem bottle gently to pour liquid into the
  measuring chamber
• Measure the right amount for your waste tank – add 2-3 litres of
  water to the waste tank or follow manufacturer's instructions
• Empty the dose into your waste tank
• Repeat the process for your flush tank – 5ml of one-chem dilutes
  to 8 litres of flush water
• Replace the child-proof cap