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Cal-Max by Grotek is the ideal supplement to correct and prevent calcium, magnesium, and iron deficiencies in homegrown cannabis.
This deficiency corrector is quickly absorbed and suitable for irrigation and foliar application, helping your plants grow healthy and productive.

Cal-Max by Grotek is a supplement specially formulated to address deficiencies of calcium (Ca), magnesium (Mg), iron (Fe), and nitrogen (N) in intensive and fast-growing crops.
Thanks to its total solubility in water, it can be easily applied in automatic irrigation systems and mediums such as coco, soil, hydroponics, or NFT, without risk of clogging pipes.
This fertilizer is ideal for growers using reverse osmosis or distilled water, as it helps raise the EC of the water to the optimal value of 0.4, providing a balanced nutrient environment that ensures healthy development in your cannabis plants.
At Hydroponics Blanes, the main trusted Grow Shop in Spain, we offer Cal-Max by Grotek with discreet shipping and personalized attention.
To ensure maximum effectiveness of Cal-Max by Grotek, it is essential to follow the dosage recommendations:
In irrigation: Add 1 to 2 ml of Cal-Max by Grotek per liter of nutrient solution to correct calcium and magnesium deficiencies in irrigation water. To adjust the EC, you can adjust the amount according to your crop's needs.
Foliar application: Dilute 1 ml of Cal-Max by Grotek per liter of water and spray both sides of the leaves with a sprayer. Remember that foliar applications should be carried out in low light conditions (before the lights go out indoors or when the sun sets outdoors), thus avoiding possible burns on the plants.
Cal-Max by Grotek offers a carefully balanced composition to ensure the supply of the most essential nutrients in cannabis cultivation:
NPK 2-0-0
This balance ensures that plants receive an optimal supplement of calcium, magnesium, and iron, helping to prevent and correct any deficiency, especially when grown in reverse osmosis or distilled water.
Cal-Max by Grotek is a powerful tool for self-cultivation of cannabis, with multiple benefits for the growth and development of your plants:
Rapid correction of deficiencies: Its immediate absorption facilitates the correction of visible calcium, magnesium, and iron deficiencies, promoting optimal plant development.
Suitable for automatic irrigation systems: Thanks to its complete solubility, it is safe to use in irrigation systems such as drip or hydroponic, without risk of clogging pipes or drippers.
Compatibility with various growing media: Cal-Max by Grotek is compatible with soil, coco, hydroponics, NFT, and aeroponics, offering versatility for all types of growers.
Adjusted EC: Especially useful for reverse osmosis or distilled water, as it allows you to raise the EC of the water to safe and optimal levels for cannabis cultivation.
Flowering boost: By preventing and correcting deficiencies, Cal-Max by Grotek helps plants have more energy during flowering, resulting in more productive and healthy harvests.
Cal-Max by Grotek is a supplement designed to address nutrient deficiencies in intensive crops, providing calcium, magnesium, iron, and nitrogen to cannabis plants in environments where these elements may be lacking.
The product is recommended both for growers who use reverse osmosis or distilled water and for those who want to correct specific deficiencies in cannabis cultivation.
This supplement is easy to use and is formulated to provide additional nutrition with each irrigation or foliar application, ensuring efficient nutrient assimilation and promoting healthy plant development throughout their life cycle.
Cal-Max by Grotek is available at Hydroponics Blanes, your trusted Grow Shop in Spain.
At Hydroponics Blanes, we offer discreet and fast shipping, guaranteeing a safe and accessible shopping experience for all growers. In addition, our experts advise you so that you choose the most suitable Grotek Fertilizers for your crop, thus achieving maximum yield and health in self-cultivation of cannabis.
Cal-Max by Grotek is the perfect solution to maintain a balanced nutrient environment in your cannabis crop.
This supplement ensures optimal growth and prevents deficiencies that could affect the development of your plants in their most crucial stages.
With its composition rich in calcium, magnesium, and iron, Cal-Max by Grotek becomes an essential resource for any grower seeking to ensure the best quality and resilience in their harvest.
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