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![PDF] Effect of composition and depth of filter-bed on the efficiency of Sand -intermittent-filter treating the Industrial wastewater at Haridwar, India | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/fe330e2b32df7e68fab5a874369639310b1e854b/3-Figure1-1.png "PDF] Effect of composition and depth of filter-bed on the efficiency of Sand -intermittent-filter treating the Industrial wastewater at Haridwar, India | Semantic Scholar")
PDF] Effect of composition and depth of filter-bed on the efficiency of Sand -intermittent-filter treating the Industrial wastewater at Haridwar, India | Semantic Scholar
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