VIVOSUN pH Control Kit, Set of 32oz, pH Up & pH Down

The VIVOSUN pH Control Kit provides a two-bottle solution for balancing the acidity and alkalinity of plant nutrient mixtures. Designed for growers managing soil, coco coir, hydroponics, aeroponics, or deep water culture (DWC), this set helps keep solutions in the optimal 5.5 to 6.5 range. Maintaining this window ensures plants can properly absorb water and nutrients, supporting root development and overall growth across every stage.

The kit contains two distinct formulas: pH Up uses commercial-grade potassium hydroxide to raise pH levels, while pH Down relies on commercial-grade phosphoric acid to lower them. Both formulas are 100% water-soluble and made in the USA without extra dyes or additives. Because the solutions are highly concentrated, you only need to add a few drops at a time to shift the pH balance of your water.

Using the kit requires a cautious approach. You must first check your starting water or nutrient solution with a separate digital meter or test strips, then slowly introduce the adjuster in small increments until you reach the target reading. Because these are concentrated liquids, adding too much at once can swing your pH too far, requiring counter-adjustments. The kit also does not include measuring droppers or testing tools in the package.

Verdict: This set is an effective, versatile choice for indoor and outdoor gardeners who need reliable pH management for their feeding routines. It suits anyone running soil, coco, or hydroponic systems who already owns a testing tool and wants concentrated adjusters that last.

A great fit if you:

• Grow in hydroponic, DWC, aeroponic, coco coir, or soil setups
• Want concentrated pH adjusters without added dyes or fillers
• Already have a digital pH meter or testing strips ready to use
• Need to adjust feeding water across different plant growth stages

Consider something else if you:

• Need an all-in-one starter kit that includes testing tools or droppers
• Prefer pre-diluted formulas that do not require drop-by-drop caution

What active ingredients are in these formulas?
The pH Up is formulated with commercial-grade potassium hydroxide, while the pH Down contains commercial-grade phosphoric acid.

What growing mediums is this kit compatible with?
It is designed for use in soil, coco coir, hydroponics, aeroponics, deep water culture (DWC), and any other growing medium or system.

How do you apply the adjusters?
Test your water or nutrient solution first with test strips or a digital pH meter, then carefully add small increments of pH Up or pH Down until the solution reaches the 5.5 to 6.5 range.