General Hydroponics® pH Control Kit - 4-Piece - 8oz pH Up, 8oz pH Down, 1oz Indicator & Vial

Complete pH Management Solution in One Kit — General Hydroponics pH Control Kit

The General Hydroponics pH Control Kit is an all-in-one pH management solution that gives growers everything needed to monitor and adjust nutrient solution pH in a single package. The kit includes 8oz pH Up (formulated with potassium hydroxide and potassium carbonate), 8oz pH Down (food-grade phosphoric acid), a 1oz pH Test Indicator, and a test vial, covering the pH management cycle from testing to adjustment in one purchase.

Key Features & Benefits

• Complete Kit — Test and Adjust: Test indicator, vial, pH Up, and pH Down in one package eliminate the need for separate purchases.
• Food-Grade pH Down: Uses food-grade phosphoric acid to lower pH accurately and safely to the target level.
• pH Up with Dual-Base Formula: Formulated with potassium hydroxide and potassium carbonate for reliable alkalinity adjustment.
• Wide pH Detection Range: The pH Test Indicator reads across a pH 4.0-8.5 spectrum, covering the full range relevant to hydroponic nutrient management.
• Ideal Range Guidance: Target pH for most hydroponic crops is 5.5-6.5, and the indicator lets you verify and maintain this range.

Who Should Use This

Well suited for new hydroponic growers setting up their first system, as well as experienced growers who want a compact all-in-one kit for daily pH management. Also works as a backup testing method alongside digital pH meters.

Compatibility

Compatible with all hydroponic nutrient solutions and growing system types. The pH Test Indicator works with 3 drops per 5 mL of solution for color readings across the pH 4.0-8.5 range.

About General Hydroponics

General Hydroponics (Santa Rosa, CA) is a Hawthorne Gardening Company brand, now under Vireo Growth, and the pH Control Kit bundles its core pH management tools into one package.

Frequently Asked Questions

What is included in the pH Control Kit?

The kit includes one 8oz bottle of pH Up (potassium hydroxide and potassium carbonate), one 8oz bottle of pH Down (food-grade phosphoric acid), one 1oz pH Test Indicator, and one test vial. That combination covers testing and adjustment in both directions from a single purchase.

How do I use the pH Test Indicator?

Fill the vial halfway with nutrient solution, then add 3 drops of pH Test Indicator per 5 mL of solution. Compare the resulting color against the color chart to determine pH.

What pH range should I target for hydroponics?

The ideal pH range for most hydroponic crops is 5.5-6.5. The pH Test Indicator detects across pH 4.0-8.5, well beyond the practical management range.

When would I use the liquid indicator instead of a digital meter?

Use the liquid indicator as a backup or cross-check whenever a digital meter might be due for calibration or could be drifting. Many experienced growers keep both on hand for the highest confidence in their pH readings.