Grotek Cal Max


Grotek Cal Max works to charge soilless media and bring plants back from common minor nutrient deficiencies resulting from nutrient imbalance, rapid growth, or overly humid conditions.

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Grotek Cal Max

Grotek Cal Max is a must for growers using coir based soils. Available nitrogen fuels chlorophyll and protein production to quickly re-green starved plants.  Chelated iron adds more deficiency fighting power for lush green growth. Added calcium helps to improve plant vigor and assist in times of peak growth.

Provides a Range of Minerals.

A rapid source of nitrogen and magnesium to support chlorophyll and protein development, which quickly re-greens plants low in nitrogen. Chelated iron adds more deficiency fighting power for lush green growth. Added calcium supports plant strength and assists in times of peak growth.

Helps with High Temperatures & Humidity.

During periods of peak growth or high temperature, calcium can be a limiting factor. This formula is designed to drive calcium movement to help avert associated plant damage. Even with sufficient calcium in the soil, high temperature and humidity may hinder plants from absorbing enough. Consider using a foliar application at that point to address the issue.

Alleviates Nutrient Deficiencies in Coir-Based Medium.

Cal-Max is amazing for amending coco coir based media, with fast acting nitrogen and a strong calcium source to assist in buffering coir’s inherent imbalance.

How to Use:
  • Apply as a foliar spray for fastest recovery from nutrient deficiencies
  • Excellent for pre-charging coco coir
  • Application Rate: 1L makes 800L of solution


  • Mix 5 ml per 4L (1 tsp per 1 gal) of water
  • Use as required

Water Culture:

  • Mix 5 to 8 ml per 4L (1 to 1.5 tsp per 1 gal) of water
  • Use as required


  • Mix 10 ml per 4 L (2 tsp per 1 gal) of water
  • Use as required
Derived From:

Calcium Nitrate, Calcium Chloride, Magnesium Nitrate, Iron EDTA.

Guaranteed Minimum Analysis:

Total Nitrogen (N) ………. 2.0%
Calcium (Ca) ………. 3.0%
Magnesium (Mg) ………. 1.0%
Iron (Fe) Chelated (actual) ………. 0.1%
EDTA (Chelating Agent) ………. 0.68%

Learn more about Grotek’s Worm Casting. Want to browse our wide selection of amazing Grotek products? Click here to view all Grotek products.

Additional information

Weight N/A
Dimensions N/A
Sustainability Features

Organic, ORMI Listed

Nutrient Application

Soil / Promix

Supplement Action

Relieve Nutrient Burn, Relieve Plant Stress

Supplement Type

(Ca) Calcium, (Mg) Magnesium, (N) Nitrogen, Chelated Minerals

Liquid Format

1 L, 10 L, 23 L, 4 L, 500ml


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