That's really expensive. You can get 81% from here for around 1/3rd the cost.Phosphoric Acid 85% ACS, FG
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Growth Technology Ph Down Controllers Nutrients Hydroponics Solution Aquarium | eBay
When growing plants in hydroponics or aeroponics, it is necessary to keep the pH of your nutrient solution within a certain range. pH Down is added sparingly to nutrient solution to help keep the acidity within this range.
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