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I pay 2.50 $ (two) USD per kilo (around 2 pounds) for citric acid at my chemistry supply store, and obviously consider this as cheap.
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I would consider that inexpensive also, provided I could get the same price.
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Disclaimer: Use at your own risk
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Considering that $10 lasts me over a year, I'm not really concerned with the price of using the right stuff. I also wouldn't recommend using something not designed for hydroponics either.