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For plants to grow their best it's important that the nutrient pH be slightly acidic - the range of 5.5 to 6.5 is considered ideal for most crops. General Hydroponics pH Up Dry provides consistent, reliable results in a powdered form for lighter weight, easy handling and safer shipping. You can add the powder to your reservoir a little at a time to raise pH. Designed to maintain a consistent reservoir pH level over time.