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TriPart Micro Hard Water Fertiliser
Regular price
$11.73
Regular price
Sale price
$11.73
Unit price
/
per
| Contenance | Prix | Prix au L | vs 500 ml |
|---|---|---|---|
| 500 ml | $11.73 | $23.46 | — |
| 1 L | $17.65 | $17.65 | −25 % |
| 5 L | $59.11 | $11.82 | −50 % |
| 10 L | $106.49 | $10.65 | −55 % |
Supplementary liquid mineral fertiliser with an NPK formula of 5-0-1: chelated iron, trace elements, and calcium nitrate reduced to 5 or 10%, for tap water that is already hard water, above 70 mg of calcium per litre. The core part of the TriPart system, dosed from seedling to harvest. Available from 500 ml to 10 L.
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Payment in instalments, free of charge
The summary
- What it is: the part of the TriPart system that supplies iron and trace elements. NPK 5-0-1, hard-water version.
- Hard or soft water: choose this version if your tap water exceeds 70 mg of calcium per litre. This is the case for most mains supplies in France.
- What it contains less of: two to three times less calcium nitrate than the soft-water version, because your water already provides it.
- How much to use: 1.2 ml per litre during growth, 2 in pre-flowering, 1.6 in flowering. The calculator converts the figures for your reservoir.
- Warning: concentrated, classified danger, H318, causes serious eye damage. Eye protection and gloves when measuring.
- Sizes and shipping: 500 ml, 1 L, 5 L or 10 L, dispatched from France.
Iron and trace elements, version for hard tap water
TriPart Micro Hard Water is the part of the Terra Aquatica TriPart system that delivers iron and trace elements, in an NPK 5-0-1 formula. It is the former FloraMicro Hard Water, formulated for hard tap water, the type supplied by the majority of French mains networks. It contains two to three times less calcium nitrate than the soft water version, because your water already provides it, and it is the only one of the three parts present at a high dose from seedling to harvest.
The difference from the soft water version comes down to one ingredient: calcium nitrate, present here at between 5 and 10 per cent compared with 15 to 22.5 per cent in the other. Everything else remains the same: the same chelated iron, the same trace elements, the same NPK 5-0-1 label formula. Using TriPart with the wrong version will not cause it to stop working altogether: it will simply drift, gradually, towards a calcium surplus or deficiency.
Finding out whether your water is affected
The distributor's analysis
Published every year, often enclosed with your bill. Look for the calcium line, in milligrams per litre. Above 70, this is the version to use.
The hardness test
A standard aquarium drop test kit is sufficient. Calcium hardness can be converted: 1 French degree equals approximately 4 mg of calcium per litre.
The indicator that doesn't lie
White deposits in the kettle, scale on the taps, a reservoir pH that rises on its own after adjustment.
pH that rises on its own: the hallmark of hard water
You adjust to 6.0 in the evening and find 6.8 the following morning. It is neither the pump nor the plants: it is the bicarbonates in your water reasserting themselves. A pH- corrector neutralises these bicarbonates; until they are consumed, every adjustment is only temporary.
Living with Hard Water
Hard water isn't bad water, it's water that already has an opinion about pH. Its bicarbonates act as an alkaline reserve: they absorb the acid you add, then release that value back into the reservoir over the following hours. As long as that reserve hasn't been depleted, every adjustment is temporary, and that's precisely the job of the pH- corrector: to neutralise it once and for all, rather than chasing the value every morning.
Calcium makes itself known elsewhere than on the pH meter. It builds up as a white crust inside drippers, on diffusers, on pump impellers, and on probes, where it skews readings before restricting flow. Between crops, soaking small components in white vinegar diluted 50/50 for one to two hours dissolves this scale without scratching the parts. Rinse thoroughly with clean water afterwards, and never pour that vinegar into a system that's running.
The simplest solution is to dilute the problem: blending tap water with rainwater, in equal parts, for example, reduces both bicarbonate levels and calcium hardness proportionally. If your water becomes consistently soft, or if you switch to a reverse osmosis unit, you'll need the soft-water version of TriPart Micro: it contains the calcium nitrate that your water no longer provides.
What this bottle provides that the other two don't
Iron, manganese, zinc, boron, copper, and molybdenum. These elements are measured in milligrams per litre of solution, yet their absence shows quickly: a solution deprived of iron produces yellowing young leaves within eight to ten days, with veins still green. That is why Micro is present at every stage, from 0.5 ml per litre at the first roots to 2 ml at pre-flowering, where Grow and Bloom rise and fall in turn.
These six elements are exactly what the Grow and the Bloom don't provide. Here is what each one does and how its absence shows up on the plant.
| Trace element | What it does | What you see when it's lacking |
|---|---|---|
| Iron | Chlorophyll production. It is supplied here in chelated form, the only way to keep it available in hard water. | Young leaves turning yellow with veins remaining green, within eight to ten days. |
| Manganese | Activates the enzymes involved in photosynthesis and oxygen release. | Yellow mottling between the veins of young leaves, followed by small dry spots. |
| Zinc | Involved in the formation of stem elongation hormones. | Short internodes, small leaves bunched tightly at the growing tip. |
| Boron | Cell wall integrity, flower pollination, apical bud growth. | Apical bud turning black, blossom drop, misshapen or corky fruit. |
| Copper | Electron transport in photosynthesis. | Dark green, limp leaves with curled tips that dry out. |
| Molybdenum | Enables the plant to convert absorbed nitrates into amino acids. | Yellowing of older leaves despite adequate nitrogen levels, with leaf blades cupping upwards. |
These six elements are measured in milligrams per litre of solution, which makes them no less essential.
In hard water, a trace element symptom is just as often a pH lockout as a genuine deficiency: our article on micronutrient deficiencies will help you tell the difference before adjusting anything.
H318, causes serious eye damage
The concentrate carries a hazard statement, the only one of the three containers to do so, due to its nitrate content. Wear safety glasses and gloves when dosing; rinse thoroughly and seek medical advice if splashed in the eyes. Once diluted in the reservoir at working doses, it no longer presents this risk.
How long does a bottle last
Of the three parts, this is the one that runs out fastest, because it is the only one present at a high dose from seedling to harvest while Grow and Bloom take turns. Here is what each bottle size actually covers.
| Size | Solution prepared at 1.2 ml per litre | Cost per 100 litres of solution | Listed price |
|---|---|---|---|
| 500 ml | approximately 415 litres | 2.38 euros | 9.90 euros |
| 1 L | approximately 830 litres | 1.79 euros | 14.90 euros |
| 5 L | approximately 4160 litres | 1.20 euros | 49.90 euros |
| 10 L | approximately 8330 litres | 1.08 euros | 89.90 euros |
Calculated at the full growth dose of 1.2 ml per litre: the listed price divided by the volume in millilitres, multiplied by the 120 ml required for 100 litres of solution. Prices as of 25 August 2026.
Moving from the 1-litre bottle to the 5-litre container nearly halves the cost per litre of solution. For a first reservoir, the complete TriPart and pH kit brings together all four 1-litre bottles and avoids tying up large volumes before you know your consumption.
When dosing, each part is added to the water separately, never one into the other, rinsing the measuring cup between each addition. The calcium in this bottle and the phosphorus in the Bloom, if brought into contact in concentrated form, produce an insoluble phosphate that sinks to the bottom and can no longer be absorbed. The Starter Kit brings all three parts together in 500 ml, with a pH adjuster sachet, so you can try the system without buying four separate bottles. To understand how pH works, see our dedicated article.
Technical specifications
The essentials
- Formula
- NPK 5-0-1Identical to the freshwater version on the label. It is the calcium content that sets them apart.
- Version
- Hard waterChoose above 70 mg of calcium per litre — the case for most mains water supplies in France.
- Calcium nitrate
- 5 to 10 %Two to three times less than the soft water version, which reaches 22.5 per cent.
- Ammonium nitrate
- 6 to 12 %Noticeably higher than the soft water version, where it tops out at 3 per cent.
- What it provides
- Iron and trace elementsManganese, zinc, boron, copper and molybdenum. Percentages are not published.
- Appearance
- Dark Brown Liquid, OdourlessThe colour comes from the iron chelates and helps avoid mixing up the bottles.
- Growth-stage dose
- 1.2 ml per litreHydroponics and coco. Increase to 2 ml at pre-flowering, then 1.6 ml at flowering.
- Maximum pH not to exceed
- 6,8Beyond this, chelated iron gradually becomes unavailable. In hard water, this is the main point to watch.
Safety, storage and identification
- Classification
- Danger, H318Causes serious eye damage. The only one of the three bottles in the system to carry a hazard statement.
- Equipment for dosing
- Goggles and glovesSafety precaution P280. In case of eye contact, rinse thoroughly and seek medical advice.
- SVHC-listed substance
- Boric acidBoron is an essential trace element. Its form appears on the ECHA candidate list.
- Concentrate pH
- 5,6That of the product in its container, not to be confused with the target pH in the reservoir.
- Relative density
- 1.108One litre weighs approximately 1.11 kg.
- Storage
- Upright, sealed, in a cool placeStore in a dry, well-ventilated place, away from food and combustible materials.
- Manufacture
- Fleurance, FranceTerra Aquatica, formerly General Hydroponics Europe.
- Former name
- FloraMicro Hard WaterSame product, sold under the General Hydroponics Europe brand before the name change.
8 further specifications are available in the detailed view.
In the box
- 1 bottle of TriPart Micro hard water in the chosen size: 500 ml, 1 L, 5 L or 10 L.
- No measure, no syringe and no safety goggles are included. Make sure you have them: this concentrate is classified H318.
- The Grow and the Bloom are not included: all three parts are sold together.
- No pH corrector is included. In hard water it quickly becomes essential: see the liquid pH-.
- No water hardness test is included: see the water analysis collection.
The 5-0-1 formula is the one printed on the label. The ammonium nitrate and calcium nitrate contents, the H318 classification, the SVHC designation for boric acid, the pH of the concentrate, the density and the appearance all come from the manufacturer's French safety data sheet, version 9 dated 25 July 2024, compared line by line with that of the freshwater version. The 70 mg of calcium per litre threshold is corroborated by two independent reseller data sheets but has not been found verbatim in a manufacturer document: treat it as a guideline. The detail of trace elements is not published.
Grow, Micro, Bloom: what each one does in the TriPart system
The three bottles are not interchangeable and none can be used on its own. The Micro is the one that never leaves the stage, and the only one available in two versions depending on your water.
| Total nitrogen (%) | Phosphorus, P2O5 (%) | Potassium, K2O (%) | Supplies calcium and iron | Supplies magnesium | Available in soft water and hard water versions | First roots (ml/L) | Full growth (ml/L) | Pre-flowering (ml/L) | Flowering (ml/L) | Present at a high dose at every stage | Classified as hazardous | Goggles required when measuring | Liquid colour | Former name at General Hydroponics | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TriPart GrowYour choice | 3 % | 1 % | 6 % | no | yes | no | 0,5 ml/L | 1,8 ml/L | 2 ml/L | 0,8 ml/L | no | no | no | Green | FloraGro |
| Recommended TriPart MicroYour choice | 5 % | 0 % | 1 % | yes | no | yes | 0,5 ml/L | 1,2 ml/L | 2 ml/L | 1,6 ml/L | yes | yes | yes | Dark brown | FloraMicro |
| TriPart BloomYour choice | 0 % | 5 % | 4 % | no | yes | no | 0,5 ml/L | 0,6 ml/L | 1,5 ml/L | 2,4 ml/L | no | no | no | Pink | FloraBloom |
TriPart Grow
Formula as declared on the label
Total nitrogen (%)3 %
Phosphorus, P2O5 (%)1 %
Potassium, K2O (%)6 %
Supplies calcium and ironno
Supplies magnesiumyes
Available in soft water and hard water versionsno
Dosage in hydroponics, millilitres per litre
First roots (ml/L)0,5 ml/L
Full growth (ml/L)1,8 ml/L
Pre-flowering (ml/L)2 ml/L
Flowering (ml/L)0,8 ml/L
Use and safety
Present at a high dose at every stageno
Classified as hazardousno
Goggles required when measuringno
Liquid colourGreen
Former name at General HydroponicsFloraGro
TriPart MicroRecommended
Formula as declared on the label
Total nitrogen (%)5 %
Phosphorus, P2O5 (%)0 %
Potassium, K2O (%)1 %
Supplies calcium and ironyes
Supplies magnesiumno
Available in soft water and hard water versionsyes
Dosage in hydroponics, millilitres per litre
First roots (ml/L)0,5 ml/L
Full growth (ml/L)1,2 ml/L
Pre-flowering (ml/L)2 ml/L
Flowering (ml/L)1,6 ml/L
Use and safety
Present at a high dose at every stageyes
Classified as hazardousyes
Goggles required when measuringyes
Liquid colourDark brown
Former name at General HydroponicsFloraMicro
TriPart Bloom
Formula as declared on the label
Total nitrogen (%)0 %
Phosphorus, P2O5 (%)5 %
Potassium, K2O (%)4 %
Supplies calcium and ironno
Supplies magnesiumyes
Available in soft water and hard water versionsno
Dosage in hydroponics, millilitres per litre
First roots (ml/L)0,5 ml/L
Full growth (ml/L)0,6 ml/L
Pre-flowering (ml/L)1,5 ml/L
Flowering (ml/L)2,4 ml/L
Use and safety
Present at a high dose at every stageno
Classified as hazardousno
Goggles required when measuringno
Liquid colourPink
Former name at General HydroponicsFloraBloom
The formulas are those printed on the labels. Dosages come from the official application chart, hydroponics and coco fibre column; for soil, allow approximately 15 per cent less. The Micro column applies to both versions, soft water and hard water: they carry the same label formula and the same dosages, and differ only in their calcium nitrate content , 5 to 10 per cent for hard water versus 15 to 22.5 per cent for soft water. Prices are not shown in this table: they are shown correctly elsewhere on the page, in your currency.
Documents & manuals
TriPart application chart, hydroponics, coco and soil, multilingual document
The official stage-by-stage chart, in millilitres per litre for Grow, Micro, and Bloom, with the target conductivity and pH ranges. A multilingual document, with French and English presented side by side.
Safety data sheet TriPart Micro Hard Water, in French
Version 9 dated 25 July 2024. H318 classification, declared composition, protective equipment and first aid in the event of eye contact.
Safety data sheet TriPart Micro Hard Water, in English
Safety data sheet, version 9 dated 25 July 2024. Same content as the French version: H318 classification, declared composition, protection and first aid. Document in English.
Document not showing? Some publishers block display inside a frame, so open it in a tab.
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Delivery
Estimated time
It covers preparing your order and then the transit time quoted by the carrier, counted in working days.
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.
Not classified as hazardous for transport despite its H318 statement, which relates to handling rather than shipping. Tracked parcel from France. Weight ranges from approximately 600 grams for the 500 ml to approximately 12.5 kilos for the 10 L: exact shipping costs are shown at checkout once your address has been entered.
Frequently asked questions
14 questions
6 key questions, 14 in the detailed view
No questions in this category.
How much TriPart Micro for your reservoir
Enter the volume of water in your reservoir. The calculation applies the full-growth dose for hydroponics and coco, 1.2 ml per litre.
L
5 L1000 L
0ml
of TriPart Micro hard water, full growth dose in hydroponics and in coco
Pre-flowering dose, the maximum of the cycle
0 ml
Doses by growth stage in hydroponics and coco: 0.5 ml per litre at first roots, 1 at first leaves, 1.2 in growth, 2 in pre-flowering, 1.6 in flowering. In soil: 0.2, 0.6, 1, 1.5 and 1.4. Hard water adds its own background conductivity, often 0.4 to 0.5 mS when empty: measure it before adding anything and subtract it from your target.
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