[robert mitchell]

sponge ?

my wet filters a corrugated plasticy thing

[CleanClear]

sponge ?

my wet filters a corrugated plasticy thing

See what others say then. Ours came with different filters and instructions. Instructions said use the corrugated paper card one for dry vaccuming and use the sponge one for wet/damp vaccuming. Made sense to me.

[ChumBucket]

What to do with the Nilfisk-

Buy some universal filter sheets like these- http://www.dustbag.co.uk/?i=656&utm_source=google&utm_medium=mc&utm_campaign=rss&gclid=CjwKEAiAnLGjBRCk_I-y_4iAmB0SJADGjWWzi6sRkP5k-XzW2ojCuqttx3trkutscTEo92tw2kaXgRoCPOfw_wcB

Wrap them around the main filter & hold them in place with a bit of gaffer tape. This doesn't restrict suction but does mean you can pull it off & put a clean one back on & the main filter remains clean- meaning you can work longer. Works a treat.