Backwash filters. Anyone used them for filtering river water?

Question

I need to pre-filter water from river before it gets to sediment cartridge filter. I am thinking it will work but am concerned algae nay be a problem and clog backwash sand filter prematurely. Anyone had experience with this? Cartridge filter clogs in about a week so is an expensive problem. Any alternative way of doing this?

Apparently the algae would be a problem in a pool type backwash filter. It would propagate in a warm vessel. Also backwash (with the same supply of water) would only add to the problem. Any other ideas?

Answer 1

Tea strainer works,,,

Answer 2

Would love to know the answer to this; we have the same problem; Have to put very thin netting (called tulle) around the cartrige filter to keep out sediment, but still it is a pain to pull up the hose, take the filter cartridge out and replace the tulle every couple of weeks Will be keeping an eye on this question..

Answer 3

Back wash filter use few grades of sand and gravel for filtration.
1)There must be a expansion volume for backwash ,least you wash away the sand during backwash
2)perforated nozzle to prevent sand/gravel to flow out of the filtrate.

a) bottom layer : gravel
b)middle layer:course sand
c)top layer:fine sand
c)drain valve,inlet valve,backwash valve,service valve n by pass valve
d)optional :pressure gauges .2 monitor pressure drops.Inlet and discharge

Piece of cake if you know how or info from book on filtration

Answer 4

There are strainers designed to fit onto the end or the pipe.

They are quite often combined with a foot valve.

Look for a sand-point.

Good Luck.