The phrase "filter away" is grammatically correct and can be used in written English.
It means to remove or separate something using a filter. Example: We need to filter away the impurities before drinking the water from the river.
A spokesman said that the pens would remain in place for as long as necessary, but by 3pm police had loosened the cordon around the Bank and allowed crowds to filter away along Queen Victoria Street.
Your New York gangster fantasies are just a black and white filter away from perfect.
Thus, we filter away both pixels that do not have any signal and pixels that do not show any difference when demeaned between annual time steps.
When it was all over, mourners left to filter away to a lot of mini-wakes across the city, where they could finally discuss the indisputable brilliance of the Iron Lady without having to answer any awkward questions about why she called Mandela a terrorist and what the point of the Falklands War was really.
All 14×3 images were loaded into the DeCyder Batch processor, and the program was set to find 3000 spots in each image then filter away artefacts and finally to do a primary matching between all the different gel images.
To enhance the quality of the results, we filter away inconsistent elements using alignment-based techniques.
Inevitably, the start was delayed and the crowd filtered away.
The new building, near the campus, once a printing plant, filters away most glints of personality.
The audience filters away to a Bowie voiceover: "see you all once again, another day, in another place".
With its roving paths, its fountain and trees, it filtered away the facelessness and noise of the street.
As the night went on, the families filtered away and the pre-bar regulars began to trickle in.
