Radongrow pH Down — Liquid pH Reducer for Hydroponics & Soil

A concentrated, proprietary buffered pH-reducing blend (no phosphoric acid) that safely lowers the pH of your nutrient water so plants can absorb every nutrient you feed them.

Even the best fertilizer is wasted if your water pH is wrong. When pH drifts too high, roots simply cannot take up key nutrients — a problem growers call nutrient lockout. Radongrow pH Down brings your nutrient solution back into the ideal range so your plants feed properly and grow to their full potential.

Made with our proprietary blend (phosphoric-acid-free), Radongrow pH Down is highly concentrated, so a small quantity adjusts a large volume of water. It works fast, holds pH steady between reservoir changes, and is suitable for hydroponics, coco, soil-less media, drip and continuous liquid-feed systems used in polyhouse and greenhouse setups. This proprietary formulation does not meaningfully raise your solution's TDS/EC and will not cause phosphorus build-up or phosphorus toxicity in your reservoir.

Key benefits:

Lowers nutrient solution pH quickly and precisely
Proprietary, phosphoric-acid-free blend — won't meaningfully raise TDS or cause phosphorus toxicity
Highly concentrated — a little goes a long way, lowering your cost per use
Stable buffering holds pH between reservoir changes
Ideal for hydroponics, coco, soil, drip and NFT / flood-and-drain systems
Prevents nutrient lockout for stronger growth and better yields

How to use:

Mix your fertilizer / nutrients into fresh water first.
Add Radongrow pH Down a little at a time.
Stir well, then test the pH with a meter or test kit.
Repeat until you reach your target pH.

Target pH: 5.5–6.5 for most hydroponic crops; 6.0–6.5 for plants in soil and containers. Check pH daily for best results. Always adjust the mixed solution — never add pH Down to undiluted concentrate.

Available sizes: 500 ml, 1000 ml, 5 Ltr

Why pH control matters: You can feed your plants the best nutrients available, but if the pH of your water is outside the correct range, the roots cannot absorb them — and your investment is wasted. This is called nutrient lockout, one of the most common reasons plants underperform. Most nutrients are best absorbed when the solution pH sits between 5.5 and 6.5; outside this window, specific nutrients become locked out and unavailable even though they are present in the water.

Safety & Storage:

Corrosive. Read the label and Safety Data Sheet (SDS) before use.
Wear eye and skin protection; handle in a well-ventilated area.
Keep out of reach of children and pets.
Store upright, tightly sealed, in a cool, dry place away from direct sunlight and extreme temperatures.
Do not mix pH Up and pH Down together directly, and never add either to undiluted nutrient concentrate.
For agricultural / horticultural use only.