Comments on: Rapid Sand Filters

By: Utpal

Utpal — Tue, 27 Dec 2011 09:54:50 +0000

Dear all,
If back washing is carried out in a proper manner how long will the sand media (of a RGF) last. Is it absolutely necessary to replace the sand media after 5-7 years. Maintenance involves annual removal of the top layers os sand. Raw water is treated with alum and cationic poly electrolyte and then led to the single media filter after coagulation, flocculation and sedimentation. Water is sourced from a river. The filters are provided with header-lateral underdrains and backwashing consists of air scouring followed by water washing.
Thanks and regards

By: sajjad from iran

sajjad from iran — Mon, 12 Dec 2011 07:01:37 +0000

thank a lot for very useful information about of filtration.

By: dr.nanyaly

dr.nanyaly — Sun, 04 Dec 2011 18:38:50 +0000

Thank you very much , really it was very useful thanks again

By: Philip

Philip — Fri, 25 Nov 2011 19:16:56 +0000

It was very helpful. It is exactly what i was looking for. Thank you for such a good work. God bless you

By: Swapna

Swapna — Wed, 23 Nov 2011 11:59:52 +0000

Great learning….nice and good information. Thanks.