GRODAN - Block 4G

GRODAN 4G Rockwool Block 75x75x65mm – 42mm Hole

🌱 Grow from Seed or Clone to Harvest

Take your plants from propagation to full harvest with the GRODAN 4G Rockwool Block. Designed for serious hydroponic growers, this medium-sized block offers reliable structure, moisture control, and easy transplanting.

💧 Easy to Use – Just Soak & Grow

• 🧊 Individually wrapped for clean, easy handling
• 💦 Soak in your preferred nutrient solution or rooting tonic
• ⚡ Quickly adapts to your solution’s EC
• 🌿 Supports nutrient delivery from day one
• 🪴 Ideal for seedlings and small plants

🌋 Rockwool Growing Medium

• Made from basalt (natural volcanic rock)
• Also known as rock wool or mineral wool
• pH-neutral growing media
• Designed with air pockets for oxygen and moisture balance
• Suitable for Controlled Environment Agriculture (CEA)
• Ideal for indoor cultivation across vegetables, floriculture, and medicinal crops

📊 Strengths of Rockwool Growing

• 📏 Uniform growing medium for consistent plant behaviour
• 💧 Water-saving properties – all retained solution available to plants
• 🌍 Supports biodiversity protection
• 🌋 Abundant natural resource (basalt)
• 🏭 Manufactured under strict European regulations
• 🛡️ Food safety compliant

📏 Product Dimensions

• 📦 Block Size: 75mm x 75mm x 65mm
• 🕳️ Pre-formed Hole: 42mm diameter x 40mm depth

📌 Pro Tip for Best Results

• 💦 Pre-soak in a weak nutrient solution
• ⚖️ Adjust pH to 5.5–6.0 before use

Please choose your products carefully, as A-Grade Hydroponics reserves the right not to accept returns based on either an incorrect choice or a change of mind.

However, we love happy customers so contact us with your query and we will do our best to accommodate you. If you have queries about a product you would like to purchase, please contact us to discuss your concerns before you buy.

A-Grade Hydroponics will honour all manufacturers warranties subject to the terms and conditions of those manufacturers. However warranty does not cover abuse, neglect, improper care, loss or damage from incorrect usage.

Warranty claims will be processed at A-Grade Hydroponics' discretion as a refund, repair or replacement. If products need to be returned to us for warranty purposes e-mail us at grow@agradehydroponics.com with the receipt/invoice number, date of purchase and a brief description of the fault (including photographs where possible). We will then issue you with a product return number.

All returns should be in original packaging and have the receipt/invoice number, date of purchase, and product return number enclosed. The product return number should also be written on the outside of the package for easy identification purposes.

A-Grade Hydroponics has a strict 'no returns' or refunds policy for liquid products, like nutrients, additives, gels, calibration fluids etc, so please choose these items carefully.

*All orders are dispatched in unmarked boxes to maintain your privacy.*

DISPATCH AND DELIVERY

Orders are shipped via Australia Post or shipping platform Big Post. Orders are generally dispatched on Tuesday, Wednesday and Friday. Please allow for additional delivery time for remote areas. If you require express delivery, please contact our sales representatives at 03 9555 6667 or email grow@agradehydroponics.com to obtain a quote. 

Couriers will attempt delivery to the specified address. If no one is home to receive the delivery, the couriers will leave your parcel somewhere safe. If there is no safe place, re-delivery or collection will be offered by the carrier.

Due to the increasing frequency of online fraud and theft, we are unable to ship to P.O. Boxes and Parcel Lockers.

SHIPPING COSTS

All freight charges are calculated on weight, dimensions and location. We are committed to keeping shipping charges at a minimum and do not charge handling fees.

Please note: Freight costs are subject to change. Regional areas, large and bulky orders, and tail-lift delivery occasionally incur an additional levy. Should shipping costs need to be amended it will be to reflect the actual charges, and not incur additional ‘shipping and handling’ fees. We will notify you if this rare situation occurs.

A-Grade Hydroponics reserves the right to cancel the order if shipping costs become prohibitive and customers will be issued a full refund.

PAYMENT

All payments must be cleared before dispatch. Payments can be made online via PayPal, AfterPay, PayID or Electronic Funds Transfer. Payments can also be accepted via credit card by phoning 03 9555 6667.

Please allow at least 24 hours for payments to clear.

FULFILMENT OF ORDERS

You will be notified immediately if an item is permanently unavailable, with options for a replacement item at equal or higher value, refund or store credit.

All refunds will clear within 3-5 business days. Store Credits will be issued as an electronic Gift Card to be used online or in-store.

DANGEROUS AND PROHIBITED GOODS

These goods are available for in-store collection only.