Dyson Purifier Humidify+Cool User Manual page 11

Step 3
Make a descaling solution
Carry the water tank by its handle to the tap.
Remove the cap and evaporator. Fill the water tank halfway to the Max level
with cold tap water.
Measure out 150g of citric acid and place it in the water tank.
MAX level
Agitate gently until all the citric acid has dissolved.
Place the evaporator in the water tank. Fill the water
tank to the Max level with cold tap water.
Step 4
Replace the cap
Replace the cap and secure the cap clips in place.
Wipe off any excess water to avoid drips.
Make sure the cap is completely dry. If wet, wipe thoroughly with a dry cloth.
Step 5
Replace the tank
Slide the water tank back into your machine until it clicks securely in place.
When prompted by the LCD screen, press the Deep clean cycle button.
The Deep clean cycle will start and the LCD screen will show
a countdown timer.
Step 6
Remove the water tank
When the LCD screen shows the Deep clean cycle is complete, push down
the water tank release buttons on the sides of your machine.
Slide the water tank out of your machine. Carry the water tank by its handle
to the tap.