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Broadwell Hill (May 31st 2023)

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Re: Alum Kicks Clay Butt! #133976 Sep 29th a 06:48 PM
by Rainman
Rainman	Neo, the COMPARISONS you give are not very differant at all. The link David U gives uses a teaspoon of SLURRY (1 teaspoon alum MIXED in 1 Gallon of water) and THEN using a teaspoon of the SLURRY MIX. 1 Gallon equals 768 teaspoons. Using the weights that you provided for the alum, 1 teaspoon of alum should weigh 6.64 grams (.015 pounds). By dividing that 6.64 grams by 768 you get .00865 (rounded) grams per teaspoon of slurry mixed into the Gallon of test water. By comparison, the chart showing .2 gram per FIVE gallons equals .04 gram per gallon. Since the alum becomes a slurry and never fully dissolves, the effective, DISSOLVED alum concentrations are very close in both tests. The slurry test is more accurate because it uses the "dissolved" alum for results. As for the APPLICATION rates, 30 pounds of alum equals .000092 POUNDS of alum per GALLON of water when applied to ONE acrefoot of water (326,700 gallons)----FAR less than the TEST concentrations. As far as SAFETY concentrations, a QUART of dill pickles has an average of 1/6th teaspoon of alum in it, or 1.1 grams per gallon, or .002425 pounds per gallon, which equates to a VERY safe application rate of over 792 pounds of alum per acrefoot of water. Drinking water that has been treated with alum may contain a maximum final concentration of .000017 pounds per gallon after being filtered, but is treated at a rate of .0013 pounds per gallon (75 times greater than final product). The only data I could find pertaining to aquatic life toxicity levels for aluminum sulfate found that quantities 1000 times greater than what is used to clear a pond only showed an "accumulation" of aluminum with no known problems. Someone please check my math, but I am pretty sure it is accurate. Also FWIW, alum becomes a solid and sinks to the bottom UNLESS the ph is lower than 6.0. Ph below 6.0 aluminum dissolves and becomes toxic to fish. Then again, a ph below 6.0 by itself is not too good for the fishies! Now I need a vacation to let my brain cool down from recalling all the equations needed for this....