Category:Backwashing
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Media in category "Backwashing"
The following 2 files are in this category, out of 2 total.
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Backwashing demo at a water filtration plant.webm 45 s, 1,920 × 1,080; 133.02 MB
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Backwashing in a water filtration plant.JPG 1,876 × 2,526; 2.59 MB