- You cannot place a new order from your country (United States).
- Out-of-Stock
search
Biotabs Startrex 5kg
Biotabs Startrex 5 kg is the professional bulk format of this certified 100% organic soil conditioner (NPK 3-1-2). With 5 kilograms of Startrex, you can treat up to 1000 litres of potting soil or coco coir — sufficient capacity for multiple cultivation cycles at scale. The concentrated formulation delivers probiotic bacteria, fulvic acid and silicon to restore biological activity in sterilised substrates, accelerate root development and optimise organic fertiliser uptake. The per-kilogram cost is substantially lower than the 1.5 kg format, reducing substrate preparation costs for operations managing high volumes. Order this bulk format for maximum efficiency in professional organic cultivation.
Biotabs Startrex 5 kg — bulk soil conditioner for professional-scale substrate preparation
At production scale, substrate preparation is not a one-time task — it is a recurring operational requirement that directly impacts both crop quality and cost per plant. Biotabs Startrex 5 kg delivers the volume needed to treat hundreds of litres of growing media per cycle without the logistical overhead of frequent reordering. The formulation is identical to the 1.5 kg format — probiotic bacteria, fulvic acid, silicon, NPK 3-1-2 — but the bulk packaging provides meaningful per-kilogram savings for operations where substrate conditioning is a regular workflow. Available from Biotabs.
Volume capacity and operational planning
At the standard rate of 25 grams per 5 litres, the 5 kg format delivers exactly 200 doses — enough to condition 1000 litres of potting soil or coco coir. In practical terms:
- 100 plants in 10-litre containers
- 50 plants in 20-litre containers
- Multiple successive cycles for mid-scale operations
- Substrate revitalisation between harvest and replanting
The per-kilogram price of the 5 kg format represents a significant reduction compared to the 1.5 kg format, lowering the cost per litre of treated substrate proportionally.
Why substrate biology determines crop outcomes
Decades of soil science research confirm that microbial diversity is the primary driver of plant health in organic systems. A biologically active substrate does more than supply nutrients — it regulates nutrient availability through biological demand, protects roots through competitive exclusion of pathogens and improves the physical properties of the growing media. Startrex's probiotic bacteria initiate this process from the first irrigation, while fulvic acid accelerates nutrient transport to plant cells and silicon reinforces structural resistance. Experienced growers consistently report that substrate performance improves across successive cycles as the microbial community matures and stabilises.
Integration with the complete Biotabs system
Startrex forms the foundation layer of the Biotabs organic growing method. For optimal results, pair it with Mycotrex mycorrhizal inoculant to extend root uptake capacity by up to 700%, and BioTabs fertiliser tablets for slow-release macro and micronutrient delivery. This combination creates a self-sustaining soil ecosystem where the grower's only ongoing input is water. Adding Orgatrex liquid feed from week five provides supplemental nutrition during peak flowering demand.
Biotabs Startrex 5 kg is certified 100% organic. Order from Plant&Flower for fast delivery across Belgium.
How many litres of substrate can 5 kg of Startrex treat?
At the recommended rate of 25 grams per 5 litres, the 5 kg pack treats up to 1000 litres of potting soil or coco coir. This equates to 200 individual doses — sufficient for 100 plants in 10-litre containers or 50 plants in 20-litre containers.
Is the 5 kg Startrex more cost-effective than the 1.5 kg format?
The per-kilogram cost of the 5 kg format is substantially lower than the 1.5 kg pack. For growers who regularly prepare large volumes of substrate, this bulk pricing accumulates into significant savings over multiple cultivation cycles.
How should unused Startrex be stored?
Store Startrex in its sealed original packaging in a cool, dry location. The probiotic bacteria are maintained in a dehydrated dormant state and remain viable indefinitely as long as the product stays dry. Avoid storing in humid environments as moisture contact will activate the bacteria prematurely.
Does Startrex replace liquid fertilisers?
Startrex is a soil conditioner, not a primary fertiliser. It prepares the substrate for optimal nutrient absorption by establishing a functional microbial ecosystem. For a complete nutrition programme, combine Startrex with BioTabs fertiliser tablets (base nutrition) and Orgatrex liquid feed (supplemental nutrition from week five onwards).