Green House Additive Feeding - Calcium

by Green House Seed Co
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R 290.00

Green House - Calcium is provided as an additive in situations where the amount of calcium present in the water is below the recommended levels such as Reverse Osmosis water.

  • Very soluble, easy to use, quickly assimilated.
  • Chelated Calcium – EDTA is a stable product that does not interact with other elements.
  • Strengthens cell membrane and cell walls to protect from pests and insect attacks.
  • Presented in a powder form, it is very soluble in water. Ca2+ ion is protected by EDTA.
  • Minimum effort and very easy to use.
  • Enhances nutrient transportation.
  • Accelerates cell division and root extension.
  • Does not contain Chlorine.
  • It’s compatible with all kinds of fertilizers.

Mixing Recommendations:

When added to water make sure to start mixing immediately.

RO, Rain water or any water with an EC of 0.0:

Because these kinds of water don’t have the necessary amount of either Calcium or Magnesium, it is necessary to use Calcium additive when using any Powder Feeding products.
For your convenience Magnesium is included in all other Powder Feeding products. Also remember that most tap water already has enough Calcium.

Calcium Proportions:

These doses are for customers that are using RO water or rain water with an EC of 0.0. If you are using tap water, you need to test the hardness with Green House strips as the required doses will be lower.

GH Calcium Ca-Chelate 9,7 Ca

GH Ca-Chelate Doses (g/L)


Starting at
EC: 0,0*


0.5 (g/L)
1 (g/L)



* For accurate results we recommend to use a EC Meter

EC 0.0

Ca-CHELATE (metric)

Ca-CHELATE (imperial)

Young Plants

0.3 g/L

0.04 oz/US gal


0.8 - 1.0 g/L

0.11 oz/US gal


1.0 g/L

0.13 oz/US gal

Last 3 weeks

1.5 g/L

0.20 oz/US gal

For more information check out out article How To Use Green House Powder Feeding