Sunday, Nov 17, 2013 at 11:09
Keith,
Have been following this thread with interest, and you've had some good responses. We lived on the Diamantina River for over 20 years, and floccing water was a regular requirement of our way of life there. Have heard people bagging the Yarra for being muddy, but the Diamantina is really muddy, with suspended clay that's difficult to clear.
We used alum sulphate, and as Bantam mentioned the dosage depends on amount of clay suspended.
Clearing a 5,000gal tank would require between half - full 10L bucket of alum. We found that by dissolving the alum in hot water, the floccing was quicker, and more efficient. Just poured the mix into the tank, and stirred the water up to mix it evenly. Once the water had cleared, I'd add some hydrated lime, to neutrilise the acid, to some degree, of the alum.
The Qld Dept of Primary Industries(don't kow what they're called these days?) had a paper on floccing of water from Station dams, and gave a
test sequence, to give you a ratio of alum to water.
I wouldn't like to drink alum treated water, as it can be a bit severe on tender tummies. We used it for cooking, and other household uses, but used only rainwater for drinking, tea & coffee.
We did try filters at one stage, but the water was same colour either side of the filter :-) Can't comment on any of the chemicals mentioned above, but I feel it would be safer, and less trouble to use such products as Micropur and Aquatabs, which are available from Whitworths.
Bob.
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