Emerald Harvest pH Up - Reservoir and Nutrient Solution pH Raiser
Best for: growers whose nutrient solution or reservoir drifts too acidic and needs bringing back up into range.
Our thoughts
The less commonly needed of the two pH adjusters, but just as necessary if your water runs acidic. It's a simple weak-base solution that does exactly one job well. Worth having on the shelf even if you don't reach for it as often as pH Down.
Emerald Harvest pH Up is a weak base buffer used to correct nutrient solutions and hydroponic reservoirs that have drifted too acidic (too low). When pH falls out of the ideal range, plants can struggle to access nutrients that are already present in the solution, so simply adding more feed doesn't fix the underlying problem, correcting the pH does.
Add the required amount to bring your reservoir back into its ideal range and keep plants feeding under stable, consistent conditions rather than fighting an imbalanced solution.
How it compares
Like its pH Down counterpart, pH Up is a functional category where the main differences are concentration and dosing consistency.
- General Hydroponics pH Up and Advanced Nutrients pH Up are the most common direct alternatives, using potassium hydroxide-based formulas to the same effect.
- Potassium bicarbonate-based organic pH raisers are gentler in living soil systems but act more slowly than a straight base buffer.
- Generic pH-up solutions sold without a matched feed chart do the same basic job but with less predictable dosing.
It's a small, cheap bottle relative to the damage a stuck-low pH can do to an otherwise well-fed crop.
Usage guidance
Dose gradually and re-test, the same discipline as any pH adjuster.
Dosing
Add a small measured amount to your reservoir, mix thoroughly, then re-test pH before adding more.
Testing
Use a calibrated pH meter or pen, and re-check after the solution has fully mixed rather than immediately after dosing.
Target range
Aim for pH 5.8-6.3 in coco or soilless media, or 5.5-6.5 in rockwool and hydro systems.
Handling
Handle as a concentrated solution, avoid skin and eye contact and keep away from children and pets.
Technical specifications
- Function: Raises pH of nutrient solution or growing media
- Form: Liquid weak-base buffer
- Target pH range: 5.5-6.5 depending on medium
- Compatible media: Rockwool, coco coir, soil, hydro systems
- Sizes available: 0.95L and 3.79L
- Brand: Emerald Harvest
Who this is for
- Growers whose reservoir or growing medium tends to drift acidic
- Anyone troubleshooting apparent deficiencies that turn out to be a low-pH lockout issue
- Growers already running Emerald Harvest who want the matching pH adjuster pair
Best suited to keeping alongside pH Down as a pair, since most growers end up needing both at different points in a grow.
Our take
Less glamorous than a booster, but pH Up is what stands between a well-planned feed schedule and a crop that can't actually absorb it. Simple, reliable, and does the one job it's meant to.
Worth picking up alongside pH Down so you're covered whichever way your water drifts.
