ISN Nutrients - Cal Mag – Premium Calcium, Magnesium & Iron Fortifier
Estimated delivery: 5 - 15 Business Days.
+5 days for regional locations on average [More Info]
ISN Nutrients - Cal Mag – Premium Calcium, Magnesium & Iron Fortifier
ISN Cal Mag is a professional-grade mineral supplement engineered to provide optimum levels of Calcium, Magnesium, and Iron, alongside a specialised suite of essential trace elements. Designed to prevent and correct common deficiency symptoms, this premium additive serves as a vital insurance policy for high-performance crops, particularly those grown in coco coir or under high-intensity lighting. ISN Cal Mag strengthens the plant from the inside out, reinforcing cellular structures to improve "plant hardness" and building a robust vascular system for efficient nutrient transport. Beyond nutrition, it acts as a biological buffer, protecting plants against excessive nutrient build-up and increasing systemic resistance to environmental stressors. By ensuring these critical elements are always bioavailable, ISN Cal Mag drives the development of thick, vibrant green foliage and prevents the loss of young flowers and fruit.
Best For: Preventing leaf yellowing and curling, stopping the drop of young flowers and fruit, correcting Iron and Magnesium deficiencies, and buffering coco coir against calcium lockout.
Key Features
- Triple-Action Mineral Blend: Delivers a balanced ratio of Calcium, Magnesium, and Iron to support chlorophyll production, enzyme activation, and structural integrity.
- Structural Reinforcement: Stimulates aggressive root growth and increases "plant hardness," creating sturdier stems capable of supporting heavy, high-yielding buds.
- Yield Protection: Actively prevents the premature loss of flowers and young fruit, ensuring your plants maintain their maximum reproductive potential throughout the bloom cycle.
- Deficiency Shield: Eliminates common growth stalls such as distorted leaf growth, interveinal chlorosis (yellowing), and deformed fruit development.
- Environmental Resilience: Fortifies cellular walls, allowing plants to remain vibrant and productive even when faced with temperature fluctuations or nutrient-heavy feeding programmes.
Specifications
- Brand: ISN Nutrients (International Super Nutrients)
- Product Type: Concentrated Cal-Mag & Trace Element Supplement
- Key Ingredients: Calcium, Magnesium, Iron, and Essential Trace Elements
- Application Phase: Full Cycle (Vegetative and Flowering Stages)
- Compatible Media: Coco Coir, Hydroponics, Rockwool, and Soil
- Available Sizes: 1 Litre and 5 Litre
Ideal For (Uses)
- Coco Coir Conditioning: Essential for growers using coco-based substrates to satisfy the media’s natural cation exchange demand and prevent Calcium lockout.
- High-Intensity LED/HID Growing: Perfect for plants under powerful lighting that require elevated levels of Magnesium and Iron to maintain high photosynthetic rates.
- Foliage & Bud Strengthening: Use as a regular additive to ensure leaves remain thick and dark green, providing the energy needed for dense floral development.
| Size |
1L, 5L |
|---|
Oversized Item Delivery Options
Oversized, heavy, and structural goods ship via specialist freight. Freight is calculated at checkout from estimated packaged volumetric or physical weight. Carrier depot audits may adjust the rate — if the increase exceeds 10%, we will contact you before processing.
Available options include:
✔ Delivery to your closest depot for pickup — default method
✔ Direct delivery — requires an operational forklift on site unless Tailgate Delivery has been specifically requested and quoted (contact us — this cannot be selected at checkout)
✔ Tailgate hydraulic lift delivery — must be specifically requested; contact us for a quote (not available as a checkout option; extra fees apply; required if you do not have a forklift)
✔ Forklift loading at our warehouse (no extra charge if you arrange your own freight)
✔ Direct truck delivery (available in Victoria)
Important Notes:
- Shipping costs vary by location and method
- Any carton or consignment over 25–30kg (or over 200cm) must be palletised
- Without a specifically requested and paid Tailgate Delivery quote, palletised freight requires a forklift on site — otherwise the carrier will redirect to the nearest depot
- Bulky and oversized items cannot be delivered to a PO Box — provide a physical street address
- Failed deliveries, locked gates, unattended sites, or incorrect business/forklift declarations may incur carrier redelivery, demurrage, and restocking fees as set out in our Terms & Conditions
Business Delivery:
- Selecting a business/commercial delivery rate warrants that the address has an operational forklift and certified operator during business hours
- If the carrier cannot unload, the consignment may be redirected to a depot and secondary fees may apply
- Additional fees may apply for failed delivery attempts due to lack of appropriate unloading equipment
See our Terms & Conditions (Article 8) for full freight and delivery rules.
Important Note on Availability & Shipping
Our warehouse is a logistics hub, not a retail showroom. Listing a product online does not mean it is stored at our Thomastown warehouse — many lines ship from supplier hubs (split fulfilment may apply).
How lead times work:
- Product page ETA: The Estimated Time of Arrival (ETA) / lead-time badge shown on the product page at checkout is the agreed delivery timeframe for that order under Australian Consumer Law.
- Metro baselines: Advertised ETAs apply to standard metropolitan zones. Regional and remote addresses may take longer and may attract surcharges.
- Peak seasons: Orders in March–May, August–October, EOFY (June), Black Friday/Cyber Monday (November), and Christmas/New Year (December–January) may automatically add a 2–4 week buffer beyond the product page ETA.
- Supplier-dependent / backordered items: If stock is delayed, we will notify you with a revised ETA. You then have 7 days to accept the new timeframe or cancel for a full refund.
- Adloheat: Custom-made products from Adloheat (Pakenham, VIC) may take 4–12 weeks depending on the order.
Full fulfilment, cancellation, and freight rules are in our Terms & Conditions.
Biosecurity & Interstate Shipping Restrictions
Due to strict state biosecurity regulations, we are unable to ship some products to certain states and territories:
- Potting Mixes cannot be shipped to Western Australia (WA), the Northern Territory (NT), or Tasmania (TAS).
- Seeds cannot be shipped to Western Australia (WA).
Orders placed for these items to restricted states will be cancelled and refunded. It is the customer's responsibility to ensure that the items being ordered can lawfully be delivered to their state or territory.
We Offer the Best Prices
We are committed to offering competitive market rates. If you find an identical, currently stocked product advertised at a lower price by an authorised Australian competitor, contact us before purchase and we will review your request.
Price Match Conditions:
- The competitor must be a registered Australian business (active ABN) with a physical trading address or verified commercial presence in Australia
- The item must be identical in brand, model, SKU, gauge, dimensions, and specifications
- The lower price must be publicly advertised in AUD, currently active, and available for immediate purchase
- Excludes liquidation, clearance, closeouts, damaged goods, and discontinued lines
- Excludes overseas marketplaces and aggregators including Temu, AliExpress, eBay auction sellers, and Amazon third-party sellers
- Excludes trade quotes, bulk discounts, and custom negotiated quotes not publicly visible
- Requests must be made in writing before purchase
How to Request a Price Match:
Email [email protected] with a live link or official quote. We reserve sole discretion to verify and approve price match adjustments. See Article 6.7 of our Terms & Conditions.
Pricing Errors & 105% Store Credit
If a displayed price is incorrect due to a website error or an extraordinary supplier increase, we will contact you before processing. You may proceed at the corrected price, choose an alternative, or cancel for a full cash refund. A 105% store credit may be offered as a courtesy bonus at our sole discretion only. It is not an entitlement, and we may refuse it if we believe it is being abused or sought in bad faith. Full details: Terms & Conditions Article 6.1.
Shop
- Choosing a selection results in a full page refresh.