Acids & pH Down Adjusters

Professional Acid pH Down Adjusters for Hydroponics & Fertigation

Precise pH control is one of the most critical factors in commercial crop production. When source water alkalinity is too high or nutrient solution pH drifts out of range, plant nutrient uptake suffers — regardless of how well-formulated your fertilizer program is. Custom Hydro stocks professional-grade acid pH down solutions trusted by commercial greenhouse, nursery, and hydroponic operations across the country.

We carry sulfuric acid, phosphoric acid, and citric acid formulations in multiple sizes — from 1 gallon jerrycans for smaller operations to 55 gallon drums for large-scale facilities running automated pH dosing systems. All products are technical or food grade, very pure, and available with hazmat shipping direct to your grow facility.

Sulfuric Acid 40%

The most effective choice for high-alkalinity source water. Delivers maximum pH reduction per unit volume without introducing phosphate or other ions into your nutrient solution. Ideal for operations where phosphorus levels are already optimized.

Phosphoric Acid 75%

A dual-purpose pH down that also contributes phosphorus (0-55-0 fertilizer analysis) to your nutrient program. The preferred choice for growers who want pH correction with a nutritional benefit, or for use during high-phosphorus crop stages.

Citric Acid

A mild, organic acid option for light pH correction. Suitable for operations preferring a non-mineral acid approach or for use in organic production systems.

Choosing the Right Acid

• High alkalinity, balanced nutrient program — sulfuric acid; no unwanted ions, maximum reduction efficiency
• Moderate alkalinity, phosphorus benefit desired — phosphoric acid; pH correction plus 0-55-0 nutrition
• Light correction, organic systems — citric acid; mild and compatible with organic programs
• Automated dosing systems — sulfuric and phosphoric acid available in 55 gallon drums for injection systems

Safety & Handling

Sulfuric and phosphoric acid products are classified as hazardous materials. Always add acid to water — never add water to acid. Wear chemical-resistant gloves, eye protection, and appropriate protective clothing. A compatible drum pump is recommended for 55 gallon drum dispensing — available separately.