1 L bottle of DualPart Grow soft water, growth part NPK 5-0-5, green label

1 L bottle of DualPart Grow hard water, Hard Water mentioned on the label

500 ml bottle of grow part A for soft water

5 L container of grow-stage part for soft water

500 ml bottle of the growth part for hard water

5 L container of grow part for hard water

Hard-water grow part and NPK 1-6-4 bloom part in 1 L, to be used together

Dosage table for both parts by growth stage, in hydroponics and in soil

Two-part growth fertiliser, soft or hard water

$12.00

Format	Price	Price per L	vs 500 ml
500 ml	$12.00	$24.00	—
1 L	$18.00	$18.00	−25 %
5 L	$59.00	$11.80	−51 %
10 L	$110.00	$11.00	−54 %

$4.00 × 3 with no fees Klarna.

This liquid mineral growth fertiliser, NPK 5-0-5 with calcium and chelated trace elements, forms the first half of a two-bottle fertiliser: it is always used alongside its flowering counterpart, from seedling to harvest. It comes in a soft-water version and a hard-water version, which differ mainly in their calcium content.

It is dosed at 0.5 to 3 ml per litre in hydroponics.

Ref. TA-DPG-SW-500·Hydroponic fertiliser

Water : Freshwater

Freshwater

Hard water

Format : 500 ml

500 ml

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The summary

What you receive: a 500 ml or 1 L bottle, or a 5 or 10 L container, in soft-water or hard-water formulation.
How it works: it is used alongside the bloom part of the same fertiliser, in proportions that change with the growth stage.
The formulation: soft water below 70 mg of calcium per litre, hard water above that.
Safety: the concentrate causes serious eye damage — wear safety glasses.

Growth part of a two-bottle mineral fertiliser, available in soft water or hard water version

A two-part fertiliser separates into two bottles elements that would precipitate if concentrated together, particularly calcium and sulphates. This part contains no phosphorus: it supplies nitrogen, 60 to 70% of which is in nitrate form depending on the version, along with potassium, calcium and trace elements, whilst the bloom part NPK 1-6-4 provides phosphorus, magnesium and sulphur. You always use both together, adjusting their ratio according to your plants' growth stage.

💧 Soft water or hard water

Both versions share the same formula, NPK 5-0-5, but the soft-water version contains 3.4% calcium oxide and the hard-water version only 1%. Hard tap water already supplies a good share of the calcium needed, and the hard-water version avoids adding too much, which would block the uptake of magnesium and potassium. The threshold is 70 mg of calcium per litre, equivalent to roughly 17.5 French degrees of calcium hardness, a figure shown on your local authority's water quality report.

Choose the dedicated version for a coco coir grow medium

Coco fibre holds back some of the calcium and magnesium from the solution, which causes deficiencies in young leaves when using a standard hydroponic fertiliser. For growing on coco fibre, there is a version of this fertiliser formulated for coco fibre, NPK 4-0-5 with 5% calcium, which follows its own application schedule at similar doses. You then follow the same programme, adapted to the grow medium.

First roots

0.5 ml of grow and 0.5 ml of bloom per litre.

Full growth

3 ml of grow fertiliser to 1 ml of bloom per litre.

Flowering

1.5 ml of grow to 3 ml of bloom per litre.

Wear safety goggles when pouring the concentrate

Both versions are classified as hazardous: the concentrate causes serious eye damage. Always wear goggles when handling it, rinse immediately with water if splashed, and never mix the two neat solutions together, always add one then the other to the reservoir water. Store tightly closed, in a cool place and out of reach of children.

🌱 Preparing the reservoir

First pour the growth dose into the water, mix, then add the flowering part. For a 30-litre reservoir in full growth, that means 90 ml of this bottle and 30 ml of the flowering part, targeting a conductivity of 1.3 to 1.8 mS. Then measure the pH with a pH drop test kit and bring it to between 5.5 and 6.5. In soil, doses are lower, up to 2.5 ml per litre of this bottle.

📦 Four formats

At 3 ml per litre, the highest dose in the programme, the 500 ml bottle makes up around 165 litres of solution, the 1 L bottle around 330 litres, the 5 L container over 1,600 litres, and the 10 L container over 3,300 litres. Its dose exceeds that of the flowering part up to the pre-flowering stage, then drops to 1.5 ml during flowering: in a predominantly vegetative crop, it is therefore the first to be used up. The fertiliser complies with regulation (EU) 2019/1009, is manufactured in France, and keeps for 5 years after opening.

Technical specifications

The composition

NPK: 5-0-5Phosphorus-free
Nitrate nitrogen: 3.5% in soft water3% in hard water
Calcium oxide: 3.4% in soft water1% in hard water
Trace elements: Cu, Mn, Zn chelated EDTAChelated iron DTPA and EDDHA

Use

Full growth: 3 ml/LWith 1 ml/L of bloom feed
Maximum dose: 5 ml/L
Target conductivity: 1.3 to 1.8 mSIn full growth
Hard water version: Above 70 mg/L of calcium

The bottle

Formats: 500 ml, 1 L, 5 L, 10 L
Standard: Regulation (EU) 2019/1009PFC 1.C.I.b
Hazard classification: DangerH318 eye damage
Organic farming: Not suitable

To budget for separately

Flowering part: The 1-6-4 flowering fertiliser
pH Correction: A pH- corrector

6 further specifications are available in the detailed view.

In the box

1 bottle of 500 ml or 1 L, or 1 container of 5 or 10 L, in the chosen water version

Composition, standard, doses, conductivities, and storage information recorded on 02/10/2026 from the manufacturer's data sheets, their 2025 application chart, and their safety data sheets dated 26/07/2024. The threshold of 70 mg of calcium per litre is that specified by the manufacturer for selecting the hard-water version.

TriPart, DualPart or NovaMax: which system for growth

Three complete mineral fertilisers from the same range. They differ in the number of bottles to measure, the availability of a hard-water version, and the classification of the concentrate.

Three complete systems, three ways to dose TriPart is measured from three bottles, DualPart from two, NovaMax from one per phase. Your water type and the time you want to spend on measuring point you to the right system.

	Bottles to use during growth	Bottles to use at pre-flowering	Bottles to add at flowering	System available in soft water and hard water versions	Dose the growth bottle during full vegetative growth (ml/L)	Total applied during full growth, all bottles (ml/L)	Highest dose of a bottle in the system (ml/L)	NPK of the growth bottle	Nitrogen from the growth bottle (%)	Ranking of the growth bottle	Oxidising concentrate, statement H272
TriPart Grow growth fertiliserYour choice	3	3	3	Yes	1,8 ml/L	3,6 ml/L	2,4 ml/L	3-1-6	3 %	Uncategorised	No
Recommended DualPart GrowYour choice	2	2	2	Yes	3 ml/L	4 ml/L	3 ml/L	5-0-5	5 %	Danger, H318	No
Single-bottle liquid growth fertiliser, NPK 7-4-10Your choice	1	2	1	No	1,5 ml/L	1,5 ml/L	2,5 ml/L	7-4-10	7 %	Danger, H272 and H318	Yes

TriPart Grow growth fertiliser

Pour-top bottles

Bottles to use during growth3

Bottles to use at pre-flowering3

Bottles to add at flowering3

System available in soft water and hard water versionsYes

Doses in hydroponics

Dose the growth bottle during full vegetative growth (ml/L)1,8 ml/L

Total applied during full growth, all bottles (ml/L)3,6 ml/L

Highest dose of a bottle in the system (ml/L)2,4 ml/L

Formula and safety

NPK of the growth bottle3-1-6

Nitrogen from the growth bottle (%)3 %

Ranking of the growth bottleUncategorised

Oxidising concentrate, statement H272No

DualPart GrowRecommended

Pour-top bottles

Bottles to use during growth2

Bottles to use at pre-flowering2

Bottles to add at flowering2

System available in soft water and hard water versionsYes

Doses in hydroponics

Dose the growth bottle during full vegetative growth (ml/L)3 ml/L

Total applied during full growth, all bottles (ml/L)4 ml/L

Highest dose of a bottle in the system (ml/L)3 ml/L

Formula and safety

NPK of the growth bottle5-0-5

Nitrogen from the growth bottle (%)5 %

Ranking of the growth bottleDanger, H318

Oxidising concentrate, statement H272No

Single-bottle liquid growth fertiliser, NPK 7-4-10

Pour-top bottles

Bottles to use during growth1

Bottles to use at pre-flowering2

Bottles to add at flowering1

System available in soft water and hard water versionsNo

Doses in hydroponics

Dose the growth bottle during full vegetative growth (ml/L)1,5 ml/L

Total applied during full growth, all bottles (ml/L)1,5 ml/L

Highest dose of a bottle in the system (ml/L)2,5 ml/L

Formula and safety

NPK of the growth bottle7-4-10

Nitrogen from the growth bottle (%)7 %

Ranking of the growth bottleDanger, H272 and H318

Oxidising concentrate, statement H272Yes

Formulas: Terra Aquatica labels and official shop. Doses: 2025 feeding chart, hydroponics and coco fibre column. Classifications: French safety data sheets. Recorded on 7 October 2026.

Documents & manuals

Safety data sheet, freshwater version

The data sheet details the composition, hazard statements, and first-aid measures for the soft-water version.

PDF · 0,2 Mo

Download

Safety data sheet, hard water version

The data sheet details the composition, hazard statements, and first-aid measures for the hard-water version.

PDF · 0,2 Mo

Download

Estimate your
delivery time

Bottle or drum sent by tracked parcel from France. The exact costs and final delivery times are displayed at checkout once the address has been entered. Outside the European Union, import duties and taxes remain the responsibility of the recipient.

Frequently asked questions

6 questions

6 key questions

How do I know if my water is hard?

Can it be used without the flowering component?

What quantity for a 50-litre reservoir at full growth stage?

In what order should the two bottles be poured?

What is the difference from a single-bottle fertiliser?

Here, both bottles are used together from start to finish, and you adjust their ratio at each stage without exceeding 5 ml per litre in total.

NovaMax Grow is used on its own during the growth phase, then gives way to its flowering counterpart at no more than 2.5 ml per litre. It is available in only one version regardless of your water type, whereas this growth part is available in a hard water or soft water formulation.

Is the concentrate hazardous?

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Two-part growth fertiliser, soft or hard water

The summary