Master
They're quite small these clay particles as mentioned by isuzurover earlier. In fact they appear to be sub 30nm, smaller than a micron. Just running through sand does not appear to remove them.
Had to check what these sizes mean :
1000nm to 1 micron
1000 micron to 1 mm
Explains why the cotton sheet had no discernible effect.
One method called slow sand uses sand as the substrate but water comes in from above and removed from the bottom. The sand doesn't do the filtering, a slime of micro organisms forms on top of the sand which do the filtering.
Yeah, time might be the answer here but it's an interesting exercise so far. Seems an age old problem still being addressed in third world countries today.
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sheesh, its quite simple. give me volume PH TDS alkalinity and phosphate. any semi descent pool shop can do that for you for free. also temp.
just chucking aluminium sulphate in there ( and you do not want to use any thing else) may or may not work. you need to know what you are dealing with and you are only going to get partial answers here or rubbish.
RoverLord
In my sodbusters slave days after a thunderstorm we would use simazine to clear dams.It did kill any yabbies in there but the sheep **** mud and grass washed in would too.
I would check closely before trying this,we put a 20kg bag in a big dam,half a bag in a small dam.It also cleared the algea that grows after a summer storm.Apparently OK for stock to drink at this rate,I wouldnt drink it or put it on my gardens!!!!
The dams returned to normal looking within a week.
Andrew
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Originally Posted by LandyAndy
sheesh that's a killer, herbicide. do not do that!!!!! and it would have an effect on stock for some time.
the sheep stit and phosphate washing in with the rain is why you got algae. plenty of food for it. and to be honest a herbicide is the only way to deal with it or some other poison
Swaggie
That explains why there is no vegetation around Wheatbelt dams...
Simazine is banned in the EU because of concerns over water contamination!
If it helps, a human hair is around 20-30 microns thick and a good human eye can see down to 10-15 microns.
I am not sure where you got "sub 30 nanometres" from. Since you can't see that small and there are very few devices in the world which can measure particles that size in water.
I think you either need to use a flocculant or put up with it.
Master
Conducted the first test.
Used a 20l container, filled up bottom with say 5 cm 20mm blue metal then placed over top with 10-15cm sand. Container has stop tap on bottom to regulate flow. Results as per photo.
From left :
Sample with salt applied allowed to sit for 2-3 weeks
Sample untouched allowed to sit 2-3 weeks
Sample of water used in filtering
Sample of filtered water
To the eye the filtered water is clear with no sediment or discolouration visible.
The flow rate was very slow. Did about 2 litres overnight.
Was not the correct sand, just happened to be what they had in the quarry around the corner.
Next step I'll try to get the right sand and see how it goes.
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