Philips WP3821 User Manual

New filter cartridges are available under type number WP3911.
Replace the filter cartridge if it is clogged to prevent damage to the 

water purifier.
No part of the cartridge can be reused. Discard the used cartridge and 

replace it with a new one. 

The actual lifetime of the filter cartridge depends on the quality of the 

local water and the water pressure. For optimal performance of the 

water purifier, replace the filter cartridge if one of the following situations 

occurs:

The display shows that the remaining filter capacity is 0 litres and 

keeps flashing.

The hollow fibre of the filter cartridge (visible through the cartridge 

window) has turned rust brown or dark grey (see section ‘Cartridge 

replacement indicator’). 

You have used the filter cartridge for 6 months.

The volume of purified water decreases substantially.

The filtered water still has an unpleasant smell or is still turbid 

after purification.
Cartridge replacement indicator

To help you determine when to replace the filter cartridge, the water 

purifier and each replacement filter cartridge comes with a self-adhesive 

colour-coded cartridge replacement indicator. Place this replacement 

indicator in a convenient place for future reference. 
Tip: Remove the cover of the filter cartridge and stick the cartridge 

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