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aluminium sulfate, also known as alum is used by municipal water systems to remove turbidity (IE., dirt) in the water supply before filtering it.  Water for human consumption on a ‘home’ basis is a maximum of 150 milligrams per liter, or about one ounce by weight per fifty gallons of water.  Best to use an 80 gallon barrel with the 50 gallon depth marked on the outside.  Install two spigots, one at the very bottom, and the other about four or five inches up and offset by 4 inches.  Put the strained as best you can water into the barrel and dissolve the alum into it.  Stir for half an hour, then cover and wait 24 hours (at home this is NOT an immediate process).  Uncover and you should see most of the turbidity at the bottom.  Open the bottom spigot slowly so the turbid water flows out until the higher spigot opening has at least one inch of clear water below it.  Now open the upper spigot for a few seconds so the turbid water can drain out of it.  Once it is running clear, transfer the rest of the water into your ‘untreated’ water jugs and either treat or filter it into your ‘treated’ supply.  Ideally your group would have several of the 80 gallon barrels operating at different stages as the yield will be about 40 gallons a day per barrel. Turbidity can range from slight – it’s got a tinge of some color, but I can clearly see a coin through a foot of water, to heavy – where the coin is invisible at the same depth.  Use only the minimum amount of alum to get the job done.  Experiment now while you still have clear water to drink!  Coffee filters or fine cloth can be used to reduce turbidity to more acceptable levels.  It’s all a balancing act.

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aluminium sulfate, also known as alum is used by municipal water systems to remove turbidity (IE., dirt) in the water supply before filtering it.  Water for human consumption on a ‘home’ basis is a maximum of 150 milligrams per liter, or about one ounce by weight per fifty gallons of water.  Best to use an 80 gallon barrel with the 50 gallon depth marked on the outside.  Install two spigots, one at the very bottom, and the other about four or five inches up and offset by 4 inches.  Put the strained as best you can water into the barrel and dissolve the alum into it.  Stir for half an hour, then cover and wait 24 hours (at home this is NOT an immediate process).  Uncover and you should see most of the turbidity at the bottom.  Open the bottom spigot slowly so the turbid water flows out until the higher spigot opening has at least one inch of clear water below it.  Now open the upper spigot for a few seconds so the turbid water can drain out of it.  Once it is running clear, transfer the rest of the water into your ‘untreated’ water jugs and either treat or filter it into your ‘treated’ supply.  Ideally your group would have several of the 80 gallon barrels operating at different stages as the yield will be about 40 gallons a day per barrel. Turbidity can range from slight – it’s got a tinge of some color, but I can clearly see a coin through a foot of water, to heavy – where the coin is invisible at the same depth.  Use only the minimum amount of alum to get the job done.  Experiment now while you still have clear water to drink!  Coffee filters or fine cloth can be used to reduce turbidity to more acceptable levels.  It’s all a balancing act.