The cost of alum is really very cheap compared to other means like lime, gypsum, etc. General chemical is the primary mixer of alum, nearly all other companies buy from GenChem. You can email/call GenChem for a supplier near you. Cost will rang from 30 to 37 cents per pound. Most chemical suppliers require a $100 minimum purchase. Tell them you are a ranch (just use your initials such as R & S Ranch) otherwise you may have trouble getting them to sell to you. As for PH crash it is not nearly as big a concern as stated, BUT possible, so spend the extra $5 per 50lb pound bag and mix it in at half the weight of alum applied to be safe (That ratio makes it nearly ph neutral) The "trick" is to be truly effective is to pre mix the alum anywhere from 5:1 to 10:1 water to alum and SPRAY the mix evenly over the water. Dumping the alum in will not mix and you will waste your money (just as I did twice). If you have questions, send me a PM with your phone# and I will be glad to tell you more.
Rex
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