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 both sulfuric acid and phosphoric 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.

Sulfuric Acid 40%

The most effective choice for high-alkalinity source water. Sulfuric acid 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 and any additional input would disrupt the nutrient balance.

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. Purified by chemical and mechanical methods for a stable, nearly clear solution.

Choosing the Right Acid

• High alkalinity, balanced nutrient program — sulfuric acid is the stronger choice; no unwanted ions
• Moderate alkalinity, phosphorus benefit desired — phosphoric acid provides pH correction plus 0-55-0 nutrition
• Automated dosing systems — both acids are compatible with standard injection equipment; 55 gallon drums available for both
• Small-scale or trial use — 1 gallon and 2.5 gallon sizes available for both formulations

Safety & Handling

All 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 when handling. A compatible drum pump is recommended for 55 gallon drum dispensing — available separately.