Terra Aquatica TriPart Micro Soft Water container on white background

TriPart Micro soft water and TriPart Micro hard water side by side

The complete TriPart range: Grow, Bloom, Micro soft water and Micro hard water

TriPart application chart for hydroponics and coco fibre

TriPart Micro soft water fertiliser

$11.00

Capacity	Price	Price per L	vs 500 ml
500 ml	$11.00	$22.00	—
1 L	$16.00	$16.00	−27 %
5 L	$60.00	$12.00	−45 %
10 L	$104.00	$10.40	−53 %
60 L	$560.00	$9.33	−58 %

$3.66 × 3 with no fees Klarna.

This liquid mineral fertiliser with an NPK 5-0-1 formula supplies the calcium, chelated iron, and trace elements of the TriPart system at all stages of growth. This soft water version is designed for reverse osmosis water, rainwater, or water containing less than 70 mg of calcium per litre, and is available from 500 ml to 60 L.

Ref. TA-TPMSW-500·Hydroponic fertiliser

Capacity : 500 ml

500 ml

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The summary

What it is: the part of the TriPart system that supplies calcium, iron, and trace elements. NPK 5-0-1, in the soft water version.
Soft or hard water: choose this version if your water contains less than 70 mg of calcium per litre, or if you are starting from reverse-osmosis or rainwater.
Always present: its dose remains substantial at every stage, from 0.5 ml per litre at the first roots through to 2 ml at pre-flowering.
How much to use: 1.2 ml per litre during growth, 1.6 at flowering, 2 at pre-flowering. The calculator converts for your reservoir.
Caution: concentrate classified danger, H318, causes serious eye damage. Wear goggles and gloves when dosing.
Sizes and dispatch: 500 ml, 1 L, 5 L, 10 L, or 60 L, dispatched from France.

Calcium, iron and trace elements, RO water, rainwater or soft water version

TriPart Micro soft water is the component of the TriPart system that supplies calcium, iron, and trace elements, in an NPK 5-0-1 formula. It is the former FloraMicro Soft Water, designed for calcium-poor water, whether that is reverse osmosis water, rainwater, or tap water containing less than 70 mg of calcium per litre.

💧 The two versions of Micro

This version, freshwater

It contains between 15 and 22.5% calcium nitrate, for water with less than 70 mg of calcium per litre, osmosis and rainwater.

The hard-water version

It contains between 5 and 10% calcium nitrate, for water with more than 70 mg of calcium per litre.

How to decide

Your water supplier's annual analysis gives the calcium content. An aquarium hardness test kit also works.

Iron and trace elements are measured in milligrams per litre, which means their absence does not show up in the conductivity reading. Without iron, a solution will quickly cause yellowing in young leaves. Without calcium, it leads to leaf-tip necrosis and blossom end rot in tomatoes, known to gardeners as "black bottom." A TriPart used without its Micro component will cause deficiencies within a few weeks, regardless of how much Grow or Bloom is added.

🧪 RO or rainwater

Osmosis water contains almost no dissolved salts: no calcium, which this version compensates for with its calcium nitrate, and no bicarbonates, which act as a buffer and stabilise pH. With this water, measure the starting conductivity, close to zero, adjust the pH last, most often upwards using a pH+ corrector, then check it every other day until you understand how your system behaves.

H318, causes serious eye damage

This is the only one of the three bottles to carry a danger warning. Splashes in the eye require prolonged rinsing and medical attention. Wear eye protection and gloves when measuring doses, and pour over the reservoir rather than at face height. Once diluted in the reservoir at the recommended doses, this risk disappears.

Check your calcium level before choosing

First check the calcium content of your water, as above 70 mg per litre you will need the hard water version. The Starter Kit brings all three parts together in 500 ml. Using the wrong version will not cause any damage, but will result in water that is either calcium-deficient or overloaded, and the deficiency can take several weeks to become visible on your plants.

🔬 What this container provides

The Micro is the only one of the three parts to carry the trace elements: iron, manganese, zinc, boron, copper and molybdenum. These are elements that plants consume in minute quantities, yet their absence becomes visible very quickly, with iron leading the way. It also supplies nitrogen, primarily in nitric form, and calcium, which explains its presence at every stage of the cycle, from 0.5 ml per litre at first root development through to 2 ml at pre-flowering. Neither of the other two parts you will add can compensate for its absence, and that is what sets a three-part nutrient system apart from a simple NPK fertiliser.

📦 Sizes and storage

This container keeps for 5 years after opening, stored sealed, away from light and frost, and should be resealed immediately after each use. Keep it in its original packaging without decanting it into a transparent container, as iron chelates degrade in light. The size to choose depends on your actual annual consumption; the Micro empties at roughly the same rate as the Grow since its dose varies little once growth is under way.

Technical specifications

The essentials

Formula: NPK 5-0-1Nitrogen is present, but the product's real value lies elsewhere: the calcium and trace elements.
Version: FreshwaterChoose this option when calcium is below 70 mg per litre, in reverse osmosis or rainwater.
What it provides: Calcium, iron, trace elementsManganese, zinc, boron, copper and molybdenum, in addition to iron and calcium.
Growth dose: 1.2 ml per litreHydroponics and coco. Reaches 2 ml in pre-flowering, then 1.6 ml during flowering.

Formula and parameters

Calcium nitrate: 15 to 22.5%Two to three times more than the hard water version, which is capped at 10%.
Presence in the cycle: From seedling to harvestThe only one of the three parts that never fades at any stage.
pH not to be exceeded: 6,8Upper end of the target range during flowering. Iron, chelated EDDHA and DTPA, remains stable beyond this, but most elements are less readily absorbed.
Appearance: Dark brown liquid, odourlessThe dark colour comes from the iron chelates and makes it easy to tell the bottles apart.

Dosing safety

Classification: Danger, H318Causes serious eye damage. It is the only one of the three bottles to carry a hazard statement.
Dosing equipment: Goggles and glovesSafety advice 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 substances list.
Storage: Upright, sealed, in a cool placeStore in a dry, well-ventilated place, away from foodstuffs and combustible materials.

To budget for separately

Goggles and gloves: Concentrate classified H318Required when measuring doses. The risk disappears once the product is diluted.
pH corrector: pH+ liquidWith osmosis or rainwater, pH drops sharply: it's pH+ you need, not pH-.

6 further specifications are available in the detailed view.

In the box

1 container of TriPart Micro soft water in the chosen size: 500 ml, 1 L, 5 L, 10 L or 60 L.

Formula 5-0-1 taken from the container label. Nitrate content, H318 classification, SVHC mention for boric acid, pH of the concentrate and appearance: French safety data sheet, version 9 dated 25 July 2024. Threshold of 70 mg of calcium per litre: TriPart page on the Terra Aquatica website, accessed 7 October 2026.

Grow, Micro, Bloom: what each one does in the TriPart system

The three bottles are not interchangeable and none of them is used on its own. Micro is used at a sustained dose at every stage, and it is the only one available in two versions depending on your water.

Each bottle carries its own elements The Micro supplies iron and calcium, the Grow and the Bloom supply potassium, each at the appropriate stage. The most visible indicator tells you which bottle to measure out carefully.

	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 hazardous	Safety glasses required when measuring	Liquid colour	Previous name
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 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

Hydroponic dosage, 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 hazardousNo

Safety glasses required when measuringNo

Liquid colourGreen

Previous nameFloraGro

TriPart MicroRecommended

Formula 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

Hydroponic dosage, 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 hazardousYes

Safety glasses required when measuringYes

Liquid colourDark brown

Previous nameFloraMicro

TriPart Bloom

Formula 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

Hydroponic dosage, 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 hazardousNo

Safety glasses required when measuringNo

Liquid colourPink

Previous nameFloraBloom

Formulas recorded from the labels on the containers; classifications from the French safety data sheets. Dosages taken from the 2025 application chart, hydroponics and coco coir column. Values recorded on 10 September 2026.

Documents & manuals

TriPart application chart, hydroponics, coco and soil, multilingual document

Grow, Micro and Bloom doses stage by stage, in millilitres per litre, with the conductivity and pH ranges to aim for. Multilingual document, French included.

PDF · 4

Download

TriPart Micro Soft Water safety data sheet, in French

Version 9 dated 25 July 2024. H318 classification, declared composition, personal protective equipment, first aid in the event of eye contact.

PDF · 4

Download

Safety data sheet TriPart Micro Soft Water, in English

The same safety data sheet in English, version 9 dated 25 July 2024, including the H318 statement and the precautionary phrases in their original wording.

PDF · 4

Download

Safety data sheet TriPart Micro Hard Water, in English

The hard-water version datasheet, in English, version 9 dated 25 July 2024. Its declared composition shows the difference in calcium nitrate load between the two versions.

PDF · 4

Download

Estimate your
delivery time

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 650 grams for the 500 ml to approximately 13 kilos for the 10 L: exact shipping costs are shown at checkout once your address has been entered.

Frequently asked questions

6 questions

6 key questions

Soft water or hard water: how do you know which to use?

The choice depends on the calcium content of the water you fill your reservoir with. The threshold is 70 mg of calcium per litre: below that level, or with osmosis water, this is the version to use.

Your water	Calcium	Version to use
Osmosis or demineralised	close to 0	Soft water, this one
Rainwater	very low	Soft water, this one
Tap water, granite region	below 70 mg/L	Soft water, this one
Tap water, limestone region	above 70 mg/L	Hard water

Your water supplier's annual analysis report gives this value, and an aquarium hardness test kit works just as well. Osmosis water contains virtually no calcium: that is precisely the case for which this version is loaded with calcium nitrate. You can also manage the hardness yourself rather than working around it: mixing equal parts of water containing 100 mg of calcium per litre with rainwater gives approximately 50 mg per litre, which falls within the range for this version. The calculation can be verified by measuring the conductivity of the plain water before adding any fertiliser: a hard mains water supply often reaches 0.4 or 0.5 mS, while rainwater stays close to zero. For soil growing, use the hard water version regardless of your water supply, as soil already contributes calcium.

How much TriPart Micro for 10 litres of water?

12 mlduring growth

20 mlduring pre-flowering

16 mlduring flowering

Unlike Grow and Bloom, the Micro dose remains high at every stage. On its own, it does not make up a complete nutrient solution, as it supplies neither phosphorus nor potassium in useful quantities, but it is the one whose absence shows up fastest: young leaves turn yellow quickly through iron deficiency. Always add it separately into the water, never directly into the Bloom concentrate: the calcium in this bottle and the phosphorus in Bloom, if brought into contact at full concentration, form an insoluble calcium phosphate that sinks to the bottom and can no longer be taken up by the plant. Once diluted in the reservoir, the two coexist without issue.

What dose of Micro at each stage, and which size should you choose?

Values are in millilitres per litre, for Micro used alone.

Stage	Hydro and coco	Soil	Hydro EC
First roots	0,5	0,2	0,3 à 0,6
First true leaves	1	0,6	0,8 à 1,2
Growth	1,2	1	1,3 à 1,8
Pre-flowering	2	1,5	1,8 à 2,0
Flowering	1,6	1,4	1,4 à 2,2

The peak row is pre-flowering, not flowering: that is the stage at which the plant builds the greatest amount of new tissue.

Size	What it covers, at the growth-stage dose
500 ml	Approximately 415 L of solution.
1 L	Approximately 830 L. The right size for a home system.
5 L	Approximately 4,165 L.
10 L	Approximately 8,330 L.
60 L	Approximately 50,000 L, suited to a commercial operation.

Micro is consumed more slowly than Grow during the growth stage, but faster than it during flowering. Over a complete cycle, all three bottles tend to run out at roughly the same time.

What happens if I buy the wrong version?

Nothing happens dramatically, but nothing can be corrected by adjusting the dose either. Soft-water formula used with hard water: the solution receives calcium it already contained, and the excess inhibits the uptake of potassium and iron. Hard-water formula used with reverse-osmosis water: the plant becomes calcium-deficient, resulting in tip necrosis on leaves and blossom end rot on tomatoes.

In both cases, symptoms take 2 to 3 weeks to appear, which makes them difficult to trace back to the right cause. When young leaves are yellowing even though the dose is correct, three causes recur, in this order: a pH above 6,8, outside the range where most elements remain available — check this first; a formula that does not match your water type; a solution more than 2 weeks old in an open reservoir, where the balance between elements has shifted. If yellowing appears first on the lower leaves, iron is not the cause: look towards nitrogen or magnesium instead.

With this formula, a calcium-magnesium supplement should not be added, even with reverse-osmosis water: the calcium nitrate it contains in quantity already covers that requirement.

Why does this bottle require safety glasses?

The concentrate is classified H318, causes serious eye damage, with a danger statement. It is the only one of the three bottles in the system to carry this classification, due to the calcium ammonium nitrate it contains. Wear safety goggles and gloves when measuring doses; in the event of eye contact, rinse thoroughly and seek medical advice.

Once diluted in the reservoir at the recommended doses, this risk no longer applies. Boron, an essential trace element for plants, is supplied in the form of boric acid, a substance listed as a candidate SVHC by the European Chemicals Agency on reproductive grounds: this concerns repeated occupational exposure to the concentrate, not the diluted solution or the plants growing in it. All the more reason to wear gloves when dosing and to keep the bottle out of reach of children.

Which trace elements does it supply, and can it be used in aquaponics?

It supplies iron, manganese, zinc, boron, copper and molybdenum.

Element	What it does	What you see when it's deficient
Iron	Chlorophyll production and electron transport during photosynthesis. Supplied in chelated form, so protected against precipitation.	Young leaves yellow between veins that remain green, progressing from the top downwards.
Manganese	Plays a role in photosynthesis alongside iron.	Pale patches between the veins of young leaves, closely resembling iron deficiency.
Zinc	Stem elongation and growth hormone production.	Short internodes, small and misshapen new leaves.
Boron	Cell wall formation and flower fertilisation.	Growing points blackening, flowers failing to set.
Copper	Photosynthetic enzymes and tissue rigidity.	Dark green, limp leaves with curling tips.
Molybdenum	Conversion of absorbed nitrates into forms the plant can use.	Older leaves pale despite abundant nitrogen in the solution.

These six elements are precisely those that Grow and Bloom do not supply.

In aquaponics, on a system without fish or on a decoupled loop, it is used as in hydroponics. On a stocked pond, the situation is different: iron is almost always deficient and that is exactly what this bottle provides, but it also supplies a large amount of nitrates, which such a system does not need. To correct iron alone, a DTPA chelated iron is the precise tool; to complete the nutrition of a living pond, it is the Aquaponic Mix that is formulated for this purpose.

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 fibre, 1.2 ml per litre.

Reservoir water volume

5 L1000 L

0ml

of TriPart Micro, full-growth dose in hydroponics and on coco fibre

Pre-flowering dose, the maximum of the cycle

0 ml

Micro is the only part used at a high dose throughout the entire cycle: 0.5 ml per litre at first roots, 1 at first leaves, 1.2 during growth, 2 at pre-flowering, and 1.6 during flowering. In soil, use 0.2, 0.6, 1, 1.5 and 1.4 ml per litre respectively. It is never used on its own to make up a solution: Grow and Bloom accompany it at every stage.

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TriPart Micro soft water fertiliser

The summary