we use a&b on our hydroponic garden and…
we use a&b on our hydroponic garden and they all seem to love it
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Hydro & soil
Hydroponic Nutrients FertilizerTwo-Part Formula (A & B)Complete base nutrient system for hydroponic growing
High-performance two-part hydroponic nutrients engineered for faster uptake, cleaner reservoirs, and stronger results.
- Performance-focused formula for clean, dependable hydroponic feeding
- NPK 25-6-40 supports vigorous growth and stronger crop performance
- High-availability minerals with calcium, magnesium, potassium nitrate and trace elements
- Two-part A & B system for stable mixing and reliable nutrient uptake
- Suitable for major hydro systems including DWC, NFT, drip, coco and recirculating setups
$34.50
$45.50
Save 24%
$17.25
per litre
In every kit
Part A
Primary nutrient solution
Part B
Secondary nutrient solution
Choose select amount
“we use a&b on our hydroponic garden and they all seem to love it”
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From our growers
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Description
Professional Two-Part Nutrition, Made Simple.Developed by hydroponic farmers with over 20 years of experience, this premium two-part liquid fertiliser delivers professional-grade nutrition for everyday growers.
Suitable for hydroponic systems, indoor plants, outdoor gardens, vegetables, fruit trees and more.
Part A + Part B
Hydroponics
Soil & pots
HydroponicsSoil & potsGreat for
Hydroponic systemsCoco & media beds
Indoor plantsOutdoor gardensVegetables & herbs
Fruit trees
Seedlings
Why growers choose it
Trusted by commercial growers: developed by hydroponic farmers with over 20 years of experience.
Complete two-part nutrition: essential macro and micronutrients supplied across two bottles.
Even, healthy growth: nutrients spread through the reservoir so every plant receives a consistent feed.
Stronger roots and stems: balanced nutrients help plants build healthy roots and sturdy growth.
Greener leaves: readily available nutrients support lush, healthy foliage.
From growth to harvest: supports plants through leafy growth, flowering and fruiting.
100% water-soluble: dissolves fully for clean, efficient feeding.
Kept in two parts for a reason: calcium is separated so it stays available to your plants.
Hydroponics, pots and garden beds: the same two bottles feed systems, containers and soil.
Never mix the concentrates.Dilute Part A and Part B separately in water. Always add each one to water, not directly to the other concentrate.
✓ Made in Australia
✓ Used by professionals
✓ Bottled for home gardeners
✓ Used by professionals
✓ Bottled for home gardeners
Guaranteed Analysis
Typical nutrient analysis shown as percentage by weight (% w/w) on a formulation basis.
Typical Nutrient Analysis (% w/w)
Trace Elements
Safety DirectionsNot to be taken. Keep out of reach of children. May irritate skin or eyes. Wash hands after use and rinse all edible plants before consuming.
✓ Made in Australia
✓ Used by Professionals
✓ Bottled for Home Gardeners
✓ Used by Professionals
✓ Bottled for Home Gardeners
How to mix & feed
Never mix the concentrates together.Always dilute Part A and Part B separately in water.
Mixing rates
Correct mixing order
1Add water to your reservoir or watering container first.
2Add Part A at the correct rate and mix thoroughly into the water.
3Add Part B only after Part A is fully dispersed, then mix again.
4Apply the finished nutrient solution to your hydroponic system, pots or garden.
Measure each part separately.Do not pour undiluted Part A into Part B, as the concentrated nutrients can react and become unavailable to plants.
FAQ
How do I use Part A & Part B?
Always dilute Part A and Part B separately in water. Never mix the concentrates together.
- Hydroponics & Seedlings: 3 mL Part A + 3 mL Part B per 1L of water.
- Potted Plants & Gardens: 4 mL Part A + 4 mL Part B per 1L of water.
How should I mix Part A and Part B?
- Add Part A to the water and mix thoroughly.
- Add Part B to the diluted solution and mix thoroughly again.
- Never mix Part A and Part B together as concentrates.
Why are there two parts?
Part A and Part B are kept separate so the concentrated nutrients remain stable until they are diluted in water.
Can I use it for seedlings?
Yes. Use the Hydroponics & Seedlings rate of 3 mL Part A + 3 mL Part B per 1L of water.
Can I use it in pots and gardens?
Yes. Use 4 mL Part A + 4 mL Part B per 1L of water.
Reviews
5.0
Based on 12 reviews
Growing something great?
Share a quick review and a photo of your garden — it really helps other gardeners.
100% rated it 4 stars or higher
Genuine reviews from CompleteGrow customers.
Customer photos
6
I’m new to Hydroponics just trying a small…
I'm new to Hydroponics just trying a small tabletop system BUT I've now purchased a tower system
Amazing fertiliser
I've got lettuce and some herbs I like to grow in my indoor hydroponic setup and the growth I've had with this fertiliser is like there magic in it, the lettuce is growing so big and fast.
It dissolves cleanly aswell, and the results speak for themselves
High recommend this product, definitely will be buying again :)
Showing 3 of 12
Best For These Plants
Made for Hydroponic Systems & Grow Tents
Powerful Results in Pots & Garden Beds Too
How it Works
Hydro: 3ml A + 3ml B per 1L
Soil: 4ml A + 4ml B per 1L
Feed Your Plants
Watch Them Thrive
Hydroponic Precision Feeding
Unlock Explosive Yields with Precision High-Performance Nutrients
Eliminate the variables that hold your harvest back. eGrow A&B delivers 100% solubility and pH stability, ensuring your plants get exactly what they need, every single time
Fast turnover crops
Leafy Hydro Crops
Accelerated Growth for Cleaner, Crisper Greens.
A strong fit for fast-growing leafy crops produced in hydro systems where clean nutrient delivery, even growth and easy repeatability are essential.
- Lettuce
- Spinach
- Rocket
- Kale
Heavy feeders
Fruiting Hydro Crops
Maximum Output for Heavy-Feeding Crops.
Well suited to hydroponic tomatoes, capsicum, cucumber and similar crops where nutrient control, crop consistency and performance through active growth matter.
- Tomatoes
- Capsicum
- Cucumber
- Chilli
Clean indoor production
Hydro Herbs
Designed for reliable herb production in hydro and indoor systems.
Ideal for growers producing basil, mint, parsley and coriander in controlled environments where stable feeding and clean reservoir mixing are important.
- Basil
- Mint
- Parsley
- Coriander
Media flexibility
Coco & Inert Media
A strong choice for growers using coco, perlite and inert blends.
Built for growers who want hydro-style control in coco or inert media systems where complete nutrient delivery and consistent mixing are essential.
- Coco Coir
- Perlite
- Clay Pebbles
- Rockwool
System ready
Popular Hydro Systems
Seamless Performance in DWC, NFT & More.
Useful across a range of hydro setups where precise nutrient delivery, reliable dilution and repeatable crop feeding schedules are the priority.
- DWC
- NFT
- Drip Systems
- Dutch Buckets
Serious growers
Commercial & Greenhouse Use
Commercial-Scale Consistency & High Output.
A professional option for greenhouse, indoor and commercial-style growers who want dependable two-part nutrition for repeatable crop performance.
- Greenhouses
- Reservoir Feeding
- Production Crops
See More Plants & Systems Suited To Hydro A & B
Leafy Hydro Crops
- Lettuce
- Butterhead Lettuce
- Cos Lettuce
- Spinach
- Rocket
- Kale
- Asian Greens
- Silverbeet
- Bok Choy
- Watercress
Hydro Herbs
- Basil
- Mint
- Parsley
- Coriander
- Dill
- Chives
- Oregano
- Thyme
- Lemon Balm
- Microgreens
Fruiting Hydro Crops
- Tomatoes
- Cherry Tomatoes
- Capsicum
- Bell Peppers
- Chilli Plants
- Cucumber
- Eggplant
- Strawberries
- Zucchini
- Melons in Controlled Systems
Compatible Media Types
- Coco Coir
- Perlite
- Clay Pebbles
- Rockwool
- Vermiculite Blends
- Inert Hydro Media
- Propagation Cubes
- Net Pot Systems
Hydroponic Systems
- DWC
- Deep Water Culture
- NFT
- Drip Irrigation Systems
- Dutch Bucket Systems
- Recirculating Hydro Systems
- Run-to-Waste Systems
- Reservoir-Based Feeding
Best Use Cases
- Indoor Hydro Gardens
- Greenhouse Production
- Controlled Environment Agriculture
- Fast Turnover Crops
- Clean Reservoir Mixing
- Repeatable Feeding Programs
- Professional Crop Production
- Precision Nutrient Management
Simple Hydroponic Precision
Mix
Hydroponics & Seedlings:
3ml Part A + 3ml Part B per 1L water
3ml Part A + 3ml Part B per 1L water
Potted Plants & Gardens:
4ml Part A + 4ml Part B per 1L water
4ml Part A + 4ml Part B per 1L water
Apply
RESERVOIR • IRRIGATION • DWC
For peak performance, ensure your reservoir pH remains between 5.8–6.2. Our chelated formula is designed to stay stable, reducing the need for constant adjustments.
Thrive
MAXIMUM YIELD • PH STABILITY
A complete mineral profile designed for rapid nutrient uptake and record-breaking harvests.
How Much to Mix
Hydroponic Nutrients A & B — Mixing Calculator
Choose the guide, enter litres, and we’ll calculate how many ml of Part A and Part B to add (per litre).
Add Part A to water, stir, then add Part B. Never mix concentrates undiluted.
Reviews From Our Gardener's
5.0
Based on 12 reviews
Growing something great?
Share a quick review and a photo of your garden — it really helps other gardeners.
100% rated it 4 stars or higher
Genuine reviews from CompleteGrow customers.
Customer photos
6
we use a&b on our hydroponic garden and…
we use a&b on our hydroponic garden and they all seem to love it
I’m new to Hydroponics just trying a small…
I'm new to Hydroponics just trying a small tabletop system BUT I've now purchased a tower system
Amazing fertiliser
I've got lettuce and some herbs I like to grow in my indoor hydroponic setup and the growth I've had with this fertiliser is like there magic in it, the lettuce is growing so big and fast.
It dissolves cleanly aswell, and the results speak for themselves
High recommend this product, definitely will be buying again :)
Showing 3 of 12
Wow, noticeably better growth and excellent value
(read about my comparison)
I’ve been growing a range of plants in my hydroponic setup, mostly lettuce, kale, and spinach, and after switching to these nutrients, I’ve seen a huge improvement in growth and overall plant health. Everything in my setup stayed the same: lights, trays, timer, etc, so this was a fair comparison, and the difference was clear. My plants are growing faster, look more vibrant, and seem much healthier than when I was using the smaller bottle of nutrients that came with my kit. The cos lettuce (same seeds) also ‘stronger’ if thats possible!
These bottles are also great value for the volume you get. It’s easy to see why they come up as an Amazon recommendation. I didn’t realise how much of a difference nutrient quality could make until now.
I’ve attached a photo of my current setup (at about 4 weeks) so you can see the results for yourself. This is only half grown, I have run out of room. I think they are growing about 30% faster. Highly recommend this if you’re serious about getting better growth from your hydro system.
Holden_
Verified Buyer
Been using this fertiliser in my hydro setup and the results have been very good. The lettuce is growing fast, full, and super vibrant. I like that it’s clean and doesnt stink, mixes easily, and works without clogging anything. Has made a big difference from the last fertiliser i used.
Sydney Farmer
Verified Buyer
Commercial Hydroponic Nutrients – Hydroponic Plant Grow Part A & B
Give your plants the expert nutrition they deserve. Developed by hydroponic farmers with 25+ years of experience, CompleteGrow A & B Hydroponic Nutrients Fertilizer is a powerful, two-part liquid formula that delivers complete, balanced nutrition to your hydroponic systems, indoor plants, and edible gardens.
Formulated using premium-grade minerals for maximum solubility and fast absorption, this dual-bottle system supports full-cycle plant growth—from root development to flowering and fruiting. Perfect for use with hydroponic setups, coco coir, soil, potted plants, and even vertical gardens.
Professional-grade 2-part nutrient system (A & B)
✅ Suitable for indoor, outdoor & hydroponic setups
✅ High-grade minerals for fast absorption & visible results
✅ Includes Calcium Nitrate, Potassium Nitrate, Magnesium & more
✅ NPK Ratio: 25 – 6 – 40
✅ Used by commercial growers, now bottled for home use
✅ Australian made with free shipping
✅ Suitable for indoor, outdoor & hydroponic setups
✅ High-grade minerals for fast absorption & visible results
✅ Includes Calcium Nitrate, Potassium Nitrate, Magnesium & more
✅ NPK Ratio: 25 – 6 – 40
✅ Used by commercial growers, now bottled for home use
✅ Australian made with free shipping
NPK Ratio
-
N
25
-
P
6
-
K
40
What NPK 25-6-40 Means (Hydroponic Nutrients)
NPK 25-6-40 is a hydroponic nutrient profile with higher N and K for fast vegetative growth, leaf colour, turgor and yield quality—plus sufficient P to build roots and structure. Ideal for leafy greens, herbs, fruiting crops and general “grow” phases in DWC, NFT, flood & drain, coco and soil.
- Hydroponic nutrients: Fully water-soluble minerals for clean reservoirs and rapid uptake.
- Performance ratio: 25% nitrogen (growth/green), ~6% phosphate (roots/structure), ~40% potash (vigor, flavour, resilience).
- Two-part friendly: Commonly supplied as Part A & Part B to prevent precipitation and nutrient lockout.
Read More
In hydroponics, plants receive nutrition directly from the solution, so the NPK balance matters. With 25-6-40, nitrogen (N) supports chlorophyll production and leafy biomass; phosphorus (P) underpins root growth, energy transfer and early flowering signals; potassium (K) regulates water movement, enzyme activity and fruit quality. The elevated K in this profile helps strengthen stems, enhance colour and flavour and improve overall stress tolerance.
Our professional blends use high-purity salts such as Calcium Nitrate, Potassium Nitrate, Magnesium sources and chelated trace elements (Fe, Mn, Zn, Cu, B, Mo) for stability and availability. A two-part (A & B) format keeps calcium separate from phosphates/sulphates until diluted, preventing cloudy precipitates and keeping EC/ppm predictable.
- Use: Suitable for hydroponic systems (DWC, NFT, ebb/flow), coco coir and soil. Great for greens, herbs, tomatoes, peppers, berries and ornamentals.
- Mixing tip: Always add Part A to water and stir until dissolved, then add Part B. Never mix concentrates together.
- Pairs well with: Cal-Mag in very soft water, and a bloom booster later if you want extra flower density.
- Application: Follow label rates; apply to moist media. Monitor EC/ppm and pH for consistent results.
- Safety: Not to be taken. Keep out of reach of children. Avoid eye/skin contact and rinse edible plants before consumption.
FAQ
A & B formulas are separated to prevent nutrient lockout and ensure maximum absorption. This method is used by commercial growers for precise, stable results.
Yes! While designed for hydroponics, this formula works just as well for pots, garden beds, and even fruit trees. Just dilute as directed and apply regularly.
The approximate NPK is 25-6-40 — high in Nitrogen and Potassium for rapid vegetative growth, with enough Phosphorus to support strong roots and overall structure.
Most general fertilisers contain filler and limited nutrients. Ours delivers pure commercial-strength minerals, with macro and micro nutrients for full-spectrum plant health.
