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Pairs well with
CANNA CalMag Agent is a calcium and magnesium supplement designed for growers using soft tap water or Reverse Osmosis-filtered water as their base. Without adequate calcium and magnesium, plants struggle to take up other nutrients effectively — leading to yellowing leaves, tip burn, and stunted growth. CalMag Agent fixes this at the source, conditioning your water before you add base nutrients so everything that follows works as it should. Compatible with all growing systems and every stage of the grow cycle.
Specifications
- Add CalMag Agent to your water before any base nutrients — it needs to buffer the mineral profile of the water first before other elements are introduced.
- If your EC reads below 0.3 after dissolving your base nutrients, your water is likely too soft and CalMag Agent will make an immediate difference.
- Check your local water report for calcium and magnesium levels if you are unsure whether your tap water qualifies as soft.
How to Use
Pairs Well With
Build your full CANNA programme around CalMag Agent as your water conditioning base.
Meters & PensVerify EC after adding CalMag Agent to confirm your water profile is dialled in before adding base nutrients.
Water Conditioners & TreatmentspH adjusters, beneficial bacteria, and other water preparation products to complete your feeding setup.
Frequently Asked Questions
Do I need CalMag Agent if I use hard tap water?
Generally no. Hard water already contains elevated calcium and magnesium. CalMag Agent is for soft or RO water — check your local water report to confirm your supply's mineral content before adding any supplement.
Can I use CANNA CalMag Agent with other nutrient brands?
Yes. CalMag Agent conditions the water before base nutrients are added, making it compatible with most brands and systems — not just CANNA products.
Will CalMag Agent raise my EC reading?
Yes. Adding CalMag Agent will increase EC. Always factor this into your total EC target alongside base nutrients and additives to avoid overfeeding.
Can I use CalMag Agent all the way through to flush?
Yes. CalMag Agent can be used from seedling through to pre-harvest. Most growers discontinue it during flush along with all other nutrients, though some continue at a low dose with soft or RO water to avoid sudden mineral stress.
Is CANNA CalMag Agent the same as a generic CalMag supplement?
It delivers the same core function but is formulated specifically to integrate with the CANNA nutrient system and perform stably across CANNA's full range of substrates and growing methods.
Start With Better Water. Grow Better Plants.
If your water is soft or RO-filtered, CalMag Agent is the first thing you should be adding. Fix the foundation — everything else follows.