In StockIntense Mag Cal
£7.15
Online price · 10% online discount included
Collection only
This item is too big for our parcel service, so we don't sell it for delivery on the website. Collect it from our Bristol shop, or ask us for a delivery price.
In stock now: ·
Seen it cheaper? Ask for a price match
Found it for less at Amazon or another UK shop? Send us the link. If we agree, we beat their price by 2% on our website for 24 hours and email you to say so. Not eBay listings.
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.
Growers’ guides
- Cal-Mag Guide: Calcium and Magnesium Deficiency in PlantsWhat cal-mag is, who needs it, how to tell calcium, magnesium, nitrogen and iron deficiency apart, and how the cal-mag products we sell compare.
- pH and EC: Meters, Test Kits and pH Up/DownHow to test pH with a meter or a pH test kit, measure EC, read the makers' targets, use pH Up and pH Down, and calibrate and care for a meter.
- Grow Tent Setup: How to Set Up a Grow Tent, Step by StepHow to set up a grow tent step by step: the spot, the tent, light, extraction, intake, timers and a test run. Plus what our grow tent kits include.
