Liquid pH corrector pH-
Regular price
$12.00
Regular price
Sale price
$12.00
Unit price
/
per
| Contenance | Prix | Prix au L | vs 500 ml |
|---|---|---|---|
| 500 ml | $12.00 | $24.00 | — |
| 1 L | $19.00 | $19.00 | −21 % |
| 5 L | $66.00 | $13.20 | −45 % |
Acidic liquid pH corrector, a blend of three acids and organic buffers: it lowers the pH of a nutrient solution and stabilises it between 5.5 and 6.5, the range at which iron, manganese, and phosphorus remain available for uptake. Suitable for hydroponics, coco fibre, and soil. Available from 500 ml to 5 L, corrosive H314.
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The summary
- What it is: a liquid pH down for hydroponics, coco fibre and soil, buffered with organic regulators.
- Why buffered: a plain acid sends pH crashing down, then lets it creep back up. Here the value stabilises, which means you avoid daily corrections.
- How much to use: there is no fixed dose. It depends entirely on your water. The step-by-step method is explained in the FAQs.
- Warning: concentrated corrosive, H314, causes severe burns to skin and eyes. Gloves and eye protection are essential.
- Documents: safety data sheet in French, available to download on this page.
- Sizes and shipping: 500 ml, 1 L or 5 L, dispatched from France.
Three acids and organic buffers, to hold the pH steady rather than simply lower it
Terra Aquatica pH- is a liquid pH adjuster designed for hydroponics, coco fibre, and soil. It lowers the pH of a nutrient solution and, crucially, holds it there: it is a blend of three acids combined with organic buffers, not a bare acid. pH does not feed the plant, it determines what the plant can absorb, and that is the whole point. A perfectly dosed solution at pH 7.5 keeps iron, manganese, and phosphorus entirely out of reach of the roots: the plant shows deficiencies in the midst of plenty.
What sets this product apart from a DIY-grade acid
Adding acid to a reservoir brings the pH down, that much is straightforward. The problem comes afterwards: without any buffering capacity, the value drops sharply on addition, then rises again over the following hours due to the bicarbonates in the water and root activity. You correct it, it rises again, you correct again. This pH- is a blend of three acids combined with organic regulators: it is these that give the solution its inertia, and that keep an adjusted value stable for several days rather than just a few hours.
Vinegar, citric acid, and lemon juice all bring pH down effectively, nobody disputes that. The problem is that they are biodegradable: in a warm, oxygenated reservoir teeming with bacteria, they are carbon molecules, which is to say food. They are consumed within one to two days, the acidity they carried disappears with them, and pH climbs back to where it was. You end up correcting every two days, with the added drawback of increased oxygen consumption and a bacterial film on the walls.
Citric acid has a second, less visible effect: it is a chelating agent. It binds to the calcium and iron in the solution and alters their availability, disrupting the balance that the fertilisers had established. Adjusting pH should have no bearing on nutrition; with citrate, it does. A buffered mineral corrector does not degrade and does not enter into these reactions: what has been adjusted stays adjusted. Our article on pH regulation explains this mechanism in detail, and pH+ follows the same logic in the other direction.
Corrosive: gloves and goggles, no exceptions
The concentrate is classified H314, causing severe skin burns and serious eye damage, with a hazard statement. Its pH is 1. Never add water to acid, always add acid to a large volume of water, and never into a tank without circulation. Wear gloves and eye protection, and rinse immediately and thoroughly with water if contact occurs.
The method that saves you going back and forth
1. Always last
Fill up, add the fertilisers, mix, and only then adjust the pH. Each fertiliser shifts the value: correcting beforehand means correcting twice.
2. In small quantities
A few millilitres, twenty minutes of mixing, then re-measure. The buffer takes time to act: measuring too soon leads to over-correction.
3. Once and for all
With hard water, the first corrections consume the bicarbonates. Once that work is done, the value holds, and subsequent additions are minimal.
There is no per-litre dose for this product, and that is perfectly normal: the amount required depends entirely on the buffering capacity of your source water. Rainwater will drop with just a few drops; hard mains water may need ten times as much to achieve the same result. This is also why the hard water version of TriPart Micro exists: both problems stem from the same cause.
How much you need in practice
There is no fixed dose in millilitres per litre, and there cannot be: the quantity depends on the buffering capacity of your water, not on the volume being treated. That said, this quantity only needs to be measured once, and the result remains valid for as long as your water source stays the same.
The method comes down to four steps. Take 10 litres of your water as you use it, with fertiliser already dosed. Add the corrector using a graduated syringe, half a millilitre at a time, stirring and waiting a few minutes between each addition. Note the number of millilitres at the point where you reach your target, 6.0, for example. Then multiply by your tank volume divided by ten: 4 ml for 10 litres means 40 ml for a 100-litre tank.
The typical ranges, and they are just typical ranges, can be summed up in a sentence: rainwater or reverse-osmosis water will drop with just a few drops per 10 litres and you need to go very carefully, whereas noticeably hard tap water may need several millilitres for the same adjustment. Everything in between is possible, which is precisely why the measurement needs to be done at home. Bear in mind too that the first tanks will use more than subsequent ones, while the bicarbonates are being neutralised. A reliable instrument is the only prerequisite, see the water analysis range; and if your water requires a great deal of correction, the hard water version of TriPart Micro is the right choice for you.
pH must be measured, not estimated
A calibrated pH meter or a colorimetric test kit is essential: to the naked eye, a solution at 6.0 looks identical to one at 7.2, yet the difference in nutrient availability between the two is considerable. See the water analysis collection.
Target pH, crop by crop
A single target for the whole vegetable garden is an acceptable compromise, but you gain by adjusting it according to what is growing. Here are the typical ranges and what locks out first when you exceed them.
| Crop | Target range | What happens above it |
|---|---|---|
| Lettuce, spinach, leafy greens | 5.5 to 6.0 | Iron locks out first: young leaves turn pale even though the solution contains it. |
| Strawberries | 5.5 to 6.0 | Iron and manganese become unavailable, and runner growth slows. |
| Tomatoes, peppers, aubergines | 5.8 to 6.3 | Phosphorus precipitates with calcium, flowering is delayed and fruits remain small. |
| Basil and herbs | 5.5 to 6.5 | A wide range, these crops are forgiving, but manganese locks out beyond 6.8. |
| TriPart targets by stage | 5.5 to 6.5 up to pre-flowering, then 6.4 to 6.8 | Above 7.0, several elements lock out simultaneously and the solution becomes unreadable. |
These ranges reflect the availability of elements in the water, not plant preferences. A crop does not suffer from the number itself, it suffers from what that number makes inaccessible.
When several symptoms appear at once with no obvious pattern, pH is the first suspect, before the fertiliser composition: our article on deficiencies explains why. During flowering, the target rises as you switch to TriPart Bloom, which reduces the amount of pH corrector needed accordingly.
This corrector works naturally alongside the TriPart system, whose feeding chart gives a target pH at each stage: 5.5 to 6.5 up to pre-flowering, then 6.4 to 6.8 thereafter. The TriPart Starter Kit even includes a sachet of powder, which shows how well the two go together. Our article on pH regulation explains the mechanics in detail, and our guide to indoor hydroponics puts pH in context alongside the other parameters to monitor.
Technical specifications
The essentials
- Function
- Lowers and stabilises pHThe organic buffers it contains give the solution a buffering capacity.
- Composition
- Blend of three acidsIncluding orthophosphoric acid, at between 5 and 10 per cent, the only declared compound above the regulatory threshold.
- Concentrate pH
- 1This is a strong acid. Never pour it neat into a tank without mixing first.
- Appearance
- Yellowish liquidThe pH+ from the same range is pale blue: no risk of confusion.
- Relative density
- 1,12One litre weighs approximately 1.12 kg.
- Target pH range
- 5.5 to 6.5The range in which the plant takes up all nutrients. During flowering, the target rises to 6.4–6.8.
- Compatible
- Hydro, coco and soilThe same product for all three growing methods.
- Dosage
- Varies with waterNo fixed dose per litre exists: it all depends on the buffering capacity of your source water.
Safety, storage and identification
- Classification
- Danger, H314Causes severe skin burns and serious eye damage. Corrosive, category 1A.
- Essential equipment
- Gloves and gogglesPrecautionary statements P264 and P280. Wash hands thoroughly after handling.
- If swallowed
- Do not induce vomitingRinse mouth and call a poison centre. Precautionary statements P301 and P330 and P331.
- SVHC substances
- NoneThe mixture does not contain any substance of very high concern within the meaning of ECHA.
- Storage
- Upright, sealed, frost-freeIn its original packaging, away from bases and foodstuffs. Never transfer into a food-grade container.
- Manufacture
- Fleurance, FranceTerra Aquatica, formerly General Hydroponics Europe.
- Complementary product
- pH+ to raise levelsWith reverse osmosis or rainwater, the pH can sometimes drop too low and it is the opposite that needs correcting.
- Available formats
- 500 ml to 5 LThree sizes available. The price per litre decreases as the size increases.
8 further specifications are available in the detailed view.
In the box
- 1 bottle of liquid pH- corrector in the chosen size: 500 ml, 1 L or 5 L.
- No pH meter, no colorimetric test kit, and no calibration solution are included: see the water analysis collection.
- No gloves or safety glasses are included. Make sure you have them: this concentrate is corrosive, classified H314.
- No pipette or dosing syringe is included.
- No paper instructions are included: the safety data sheet can be downloaded from the documents section.
The H314 classification, the declared composition in orthophosphoric acid, the pH of the concentrate, the density, the appearance and the safety precautions are taken from the manufacturer's French safety data sheet, version dated 22 November 2023, downloaded and reviewed. The description as a blend of three acids with organic buffers and the range of 5.5 to 6.5 are taken from the manufacturer's French 2025 catalogue. The exact nature of the two other acids is not published: only components exceeding regulatory thresholds appear on a safety data sheet. No dose per litre is given because none exists: the quantity depends on the buffering capacity of the water being treated.
pH- or pH+: which one your water needs
Both correct pH, but in opposite directions. It is your source water that decides, not your crop or your fertiliser.
| Effect on the solution | Water affected | Active base | Concentrate pH | Liquid colour | Supplies phosphorus | Supplies potassium | Silica source | Classified corrosive H314 | Gloves and goggles are mandatory | Never mix with the other | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Recommended pH Down correctorYour choice | Lowers pH | Hard tap water | Three buffered acids | 1 | Yellowish | yes | no | no | yes | yes | yes |
| pH Up correctorYour choice | Raises pH | RO or rainwater | Potassium carbonate | 12 | Pale blue | no | yes | yes | yes | yes | yes |
pH Down correctorRecommended
What each one does
Effect on the solutionLowers pH
Water affectedHard tap water
Active baseThree buffered acids
Concentrate pH1
Liquid colourYellowish
What it brings extra
Supplies phosphorusyes
Supplies potassiumno
Silica sourceno
Safety
Classified corrosive H314yes
Gloves and goggles are mandatoryyes
Never mix with the otheryes
pH Up corrector
What each one does
Effect on the solutionRaises pH
Water affectedRO or rainwater
Active basePotassium carbonate
Concentrate pH12
Liquid colourPale blue
What it brings extra
Supplies phosphorusno
Supplies potassiumyes
Silica sourceyes
Safety
Classified corrosive H314yes
Gloves and goggles are mandatoryyes
Never mix with the otheryes
The compositions, concentrate pH values and classifications are taken from the manufacturer's French safety data sheets, version dated 22 November 2023 for pH- and 8 January 2024 for pH+. The description as a blend of three acids and as a silica source is taken from the French 2025 catalogue. The silica content of the pH+ is not published. Prices do not appear in this table: they are correct elsewhere on the page, in your currency.
Documents & manuals
Safety data sheet for pH-, in French
Version dated 22 November 2023. H314 classification, declared composition, personal protective equipment, and what to do in the event of contact or ingestion.
Safety data sheet pH-, in English
Safety data sheet, version 8 dated 22 November 2023. Same content as the French version: H314 classification, declared composition, protection and procedure to follow. Document in English.
TriPart application chart, with pH targets by growth stage, multilingual document
The official TriPart system chart: target pH and conductivity ranges at each growth stage, which this corrector is used to maintain. A multilingual document, with French and English presented side by side.
Document not showing? Some publishers block display inside a frame, so open it in a tab.
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It is not a guaranteed delivery date: public holidays, peak periods, customs or a carrier delay can extend it. The exact amount, in your currency, is worked out in the cart once your address is entered.
A corrosive product under CLP classification, dispatched in its original packaging by tracked parcel from France. Weight ranges from approximately 550 grams for the 500 ml to approximately 5.5 kg for the 5 L. Exact shipping costs and delivery times are shown at checkout once your address has been entered. Outside the European Union, import duties and taxes remain the responsibility of the recipient.
Frequently asked questions
14 questions
6 key questions, 14 in the detailed view
No questions in this category.
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