Potassium hydroxide (often labeled KOH) is a strong alkaline chemical used for pH adjustment and sold as flakes or solutions. It’s typically considered caustic, so direct contact can irritate or burn skin and eyes.

• Wear gloves, eye protection, and long sleeves when handling.
• Work in a well-ventilated area and keep it away from children and pets.
• Follow the product’s label for mixing and dilution; add small amounts and retest.
• Store sealed, upright, and away from incompatible materials.

If exposure occurs, follow the first-aid directions on the label and seek professional guidance as needed.

The most common names you’ll see are KOH and caustic potash. On garden and hydroponic items, it may also be described as a pH-raising solution or potassium hydroxide flakes.

• KOH is the chemical formula for potassium hydroxide.
• Caustic potash refers to the same compound in common trade language.
• Product titles may highlight purity or form (such as flakes or liquid).

Always rely on the specific product label for the exact composition and intended use.

Because potassium hydroxide is caustic, it’s best to prevent skin contact altogether.

• Use chemical-resistant gloves, eye protection, and long sleeves.
• Handle tools and containers carefully to avoid splashes; add small amounts slowly.
• Keep clean water and paper towels nearby for quick cleanup.
• Remove contaminated clothing and rinse skin with plenty of water if contact happens.

Check the product’s safety instructions before use. If irritation persists after rinsing, consider contacting a medical professional for guidance.

When a product says food grade, it generally refers to a purity and manufacturing standard that allows use in certain regulated applications. It doesn’t mean the chemical is safe to ingest as-is or for every purpose.

• Only use food-grade potassium hydroxide for applications listed on the product label.
• Follow all directions for dilution and handling; it remains a caustic substance.
• If you’re unsure about a specific use, review relevant regulations or consult a qualified professional.

Always prioritize the manufacturer’s directions over general advice.

Raising nutrient pH with potassium hydroxide typically involves small, gradual adjustments.

• Test your solution’s pH first with a meter or test strips.
• Dilute and add a little at a time per the product label.
• Stir or circulate, then retest before adding more to help avoid overshooting.
• Record how much you used for future reference and consistency.

Protective gear and good ventilation can improve safety. Specific amounts vary by water quality and nutrients, so follow the directions on the product you purchase.