Grotek VitaMax Plus – 10L

Grotek VitaMax Plus is a macronutrient supplement with added magnesium, formulated to support plant growth across vegetative and flowering stages. The 10L size is suited to commercial and large-scale grow operations that require a consistent supply of a multi-stage nutrient additive. It aids chlorophyll formation, encourages blooming, and assists floral and fruit development.

VitaMax Plus Specifications

Key specifications for Grotek VitaMax Plus – 10L, sourced from manufacturer and supplier data.

Specification	Value
Brand	GroTek
Product Name	VitaMax Plus
Pack Size	10 L
Shipping Weight	27.0 lb
Formulation Type	Liquid concentrate
Key Nutrients	Macronutrients with added magnesium
Application Stages	Vegetative growth, bloom, fruit and floral development
Category	Nutrients & Additives — Base Nutrients

Why Choose VitaMax Plus

VitaMax Plus is designed for growers who need a single additive that delivers across multiple growth stages rather than swapping products between vegetative and flowering phases.

• Macronutrient foundation with added magnesium: The formula provides macronutrients alongside magnesium, which is directly involved in chlorophyll synthesis. Magnesium deficiency is one of the more common issues in hydroponic and soilless systems, and having it included in the base nutrient formula reduces the need for a separate cal-mag supplement.
• Multi-stage application: VitaMax Plus is formulated to support vegetative growth, encourage blooming, and assist floral and fruit development in a single product. Growers can use it across the full crop cycle without switching additives.
• 10L bulk size reduces per-litre cost: For commercial operations or large grow rooms, the 10L format lowers the cost per application compared to smaller bottles, and reduces the frequency of reordering mid-cycle.
• GroTek formulation lineage: The VitaMax line has been developed by GroTek specifically to improve the availability of essential plant compounds. This is not a general-purpose fertilizer but a line designed around measurable plant development outcomes.

Best Uses for VitaMax Plus

VitaMax Plus is most effective in setups where the grower wants consistent macronutrient and magnesium delivery without maintaining a large additive stack. The 10L size is particularly suited to the following contexts:

• Hydroponic systems: Recirculating and drain-to-waste systems benefit from a concentrated liquid additive that mixes cleanly into reservoir water. VitaMax Plus, as a liquid concentrate, is well-suited to this application.
• Commercial and large-scale grows: Operations running multiple reservoirs or tables can use the 10L size to batch-mix nutrient solutions efficiently, keeping per-litre costs lower than retail-size bottles.
• Coco coir and soilless media: These media types are inert and rely entirely on the nutrient solution. A product formulated with macronutrients and magnesium addresses the most commonly depleted elements in coco-based grows.
• Flowering and fruiting crops: The formula explicitly addresses blooming and fruit/floral development, making it appropriate as an additive during the transition and bloom phase for fruiting crops such as tomatoes, peppers, and cannabis.
• Growers managing magnesium deficiency: If yellowing between leaf veins (interveinal chlorosis) is a recurring issue, VitaMax Plus addresses one of the most common causes — insufficient magnesium — through its base formula rather than requiring a separate corrective product. Pairing it with an organic root stimulant like Advanced Nutrients Tarantula can further support plant uptake.

Dosing Guidelines

VitaMax Plus is a liquid concentrate intended to be diluted before application. As a general practice for nutrient additives in this category, mix the concentrate into water before adding other nutrients to avoid precipitation. The following guidelines reflect standard practice for a macronutrient supplement of this type; always verify the recommended dose rate on the product label, as Grotek may update formulations.

• Shake the container well before measuring to ensure the formula is fully homogenised.
• Measure the required dose per litre or gallon of water using a calibrated syringe or measuring cup — do not estimate by eye.
• Add VitaMax Plus to fresh water first, stir, then layer in other additives one at a time.
• Check the EC (electrical conductivity) of the mixed solution and adjust total nutrient load to match the target range for your crop and growth stage.
• Adjust the pH of the final solution to the appropriate range for your growing medium: typically 5.8–6.2 for hydroponics and coco, 6.0–6.5 for soil.
• Monitor plants for leaf colour, vigour, and uptake. Scale back or increase dose based on observed response and runoff EC measurements.

For growers also supplementing with a high-brix carbohydrate source, products like Earth Juice Hi-Brix Molasses can be used alongside VitaMax Plus during the flowering phase, provided the combined EC remains within target range.

Sources & Further Reading