In StockIntense Mag Cal
£15.26£16.95Save £1.69
In stock
or buy it now with
Free UK mainland delivery over £90.00, otherwise £6.95. Order by 2pm for same-day dispatch, Monday to Friday. Details
Questions about this product? Ask us or see delivery & returns.
Description
Intense Mag-Cal is as its name suggests a Magnesium and Calcium additive for addressing deficiencies and also as a conditioner for R.O. water.
Many customers using coco and soil use this product as a matter of course up until a few weeks into flower to avoid deficiencies in magnesium and calcium which have become fairly common in recent years.
Care should be taken to avoid over-use later on in the flowering cycle as Mag-Cal also includes a fair amount of Nitrogen which is not conducive to abundant fruiting/flowering. If a magnesium or calcium deficiency is experienced later on in the cycle then look to the Canna Mono Elements to remedy this but as always extra care should be taken with identifying and treating deficiencies - as it is all too easy to produce toxicity or throw out the whole balance of your nutrient regime.
Intense Mag-Cal is available in 1l, 5l, and 10l bottles.
Key facts
| Type | Magnesium and calcium additive, also a conditioner for RO water |
|---|---|
| Also contains | A fair amount of nitrogen |
| When | Growth and the first few weeks of flowering |
| Sizes | 250 ml, 1, 5 and 10 litres |
| Brand | Intense Nutrients |
| Category | CalMag Additives |
How to use
Add Mag-Cal at the rate on the label. Many of our customers growing in coco and soil use it as a matter of course, up to a few weeks into flowering, to head off magnesium and calcium deficiencies.
Go carefully later in flowering. Mag-Cal carries a fair amount of nitrogen, which does not help flowering and fruiting. If a deficiency shows up late on, treat that element on its own, and be sure of the cause first: it is easy to cause a toxicity or upset the balance of the whole feed.
See all our CalMag additives, and check each feed with a pH and EC meter.
Questions
Can I use Mag-Cal all the way through flowering?
It is best not to. It contains a fair amount of nitrogen, which does not suit late flowering and fruiting. Most growers stop a few weeks into flowering.
Can I use it with RO water?
Yes. It works as a conditioner for reverse osmosis water as well as a fix for deficiencies.




