Description
Bring a low reservoir back into the uptake window
Emerald Harvest pH Up is a concentrated pH adjuster formulated on potassium hydroxide (caustic potash) to lift the pH of a nutrient solution that has drifted too acidic. Because it is concentrated, a small volume moves a full reservoir, which makes fine adjustment straightforward once you learn how your water responds. The potassium base means the correction adds an element the plant already uses rather than something inert. It suits soil, coco and hydroponic systems alike and belongs in any grow room where feed is mixed by hand.
Key Benefits
- Accurate correction - Concentrated formula lets you creep up on your target rather than overshoot.
- Potassium hydroxide base - Adjusts pH using an element that plants already take up.
- Economical in use - Small doses move large volumes, so it goes a long way.
- Works in any medium - Suitable for soil, coco and hydroponic reservoirs.
- Protects uptake - Keeps the solution in the pH 5.5–6.5 range where nutrients stay available.
The Cost of a Nutrient Solution That Drifts Acidic
Nutrient availability is governed by pH, not by how much you put in the tank. Let a reservoir slide down past the usable band and iron, manganese and zinc become over-available while calcium and magnesium lock away. What you see is interveinal yellowing and slow growth on plants that are, on paper, fully fed. Emerald Harvest treat a reading under pH 5.5 as too acidic for most hydroponic gardens; brown spotting and red or purple tints can also appear, but other problems look similar, so test before you correct. Correcting upwards restores the chemistry so the feed you paid for actually reaches the root.
How to Use
- Mix and stir your full nutrient solution before touching the pH.
- Add pH Up a few millilitres at a time, stirring between additions – it works within seconds.
- Allow the solution to settle, then re-test with a calibrated meter.
- Repeat in small steps until you hit your target for the medium – Emerald Harvest recommend pH 5.5–6.5 for most hydroponically grown plants.
- Wear gloves and eye protection, and store it sealed and upright in a cool, dry place out of direct sunlight – it causes severe skin burns and eye damage and is harmful if swallowed.
Technical Specifications
- Type: pH increasing solution (pH alkaliser)
- Active base: potassium hydroxide (caustic potash, 30–35%)
- Product pH: 12
- Function: raises the pH of nutrient solutions
- Recommended range: pH 5.5–6.5 for most hydroponically grown plants
- Suitable for: soil, coco and hydroponic systems
- Hazards: corrosive – causes severe skin burns and eye damage; harmful if swallowed; may be corrosive to metals
Frequently Asked Questions
How much pH Up will I need?
There is no fixed dose – it depends on your water, your feed and how far the pH has to move. Because it is concentrated, add a few millilitres at a time to the reservoir, stir, wait and re-test before adding more.
Can I use it with other nutrient brands?
Yes. It adjusts the pH of any nutrient solution. Emerald Harvest base nutrients are buffered, so growers using them usually find only small corrections are needed.
Is it safe to handle?
Treat it with care: it is a strong alkali that causes severe skin burns and eye damage and is harmful if swallowed. Wear gloves and splash goggles, never apply it neat to plants, and always mix it into the full volume of nutrient solution.
Works Well With
