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an 81% solution of phosphoric acid used to lower the ph of nutrient solutions. it is reasonably acidic though not really dangerous, ph down should be handled with care.
Measures 5.6 to 7.4 PH This test kit is excellent value for money as it will last one year at the rate of three tests the week.
Measures 4 to 8.5 PH This kit is excellent value for money as it will last one year at the rate of three tests for a week.