Troubleshooting How/when to clean my Philips PowerPro Aqua vacuum's filter To maintain optimal suction performance, we advise you to clean the filters every 2 to 4 weeks. You do not need to replace the filter. Cleaning instructions: Remove the filter compartment and take out the filter; Remove the foam filter; Clean the foam filter under a tap with cold or lukewarm water. Let the filter dry for 24 hours. Never put the filter back when the filters are still wet, as this will damage your appliance. Note: For a thorough clean, you can also clean the dust container and filter parts in cold or lukewarm water.