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Use of sand filters in septic systems edit
This article should probably mention that sand filters are increasingly used as a second treatment stage in septic and other decentralized systems. 66.80.65.244 (talk) 20:06, 18 September 2009 (UTC)
A bit disappointed that there is no reference to the history of this technology. Where was it first developed? I believe that some of the first slow sand filters in the world were put into service by a town on the River Aire (Yorkshire, England) in the 1830's but can find no reference? #### —Preceding unsigned comment added by 86.157.106.74 (talk) 19:22, 6 June 2010 (UTC)
Scince edit
What do you call the sand in the filtration process 210.185.171.18 (talk) 09:30, 9 October 2022 (UTC)
Science edit
What do you call the sand in the filtration process 210.185.171.18 (talk) 09:32, 9 October 2022 (UTC)