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calimagic 1 litre

by General Hydroponics

Price: $24.99 Loading Data
In stock

Achieve Optimal Plant Nutrition with CALiMAGic

Ensure Healthy Plant Growth with CALiMAGic

Enhance Plant Performance with CALiMAGic

Boost Plant Productivity with CALiMAGic

Prevent Plant Deficiencies with CALiMAGic

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CALiMAGic is an extraordinary nutrient supplement developed by General Hydroponics, which is designed to provide optimal levels of nutrition to both soil and hydroponic systems. CALiMAGic is composed of a balanced blend of Calcium and Magnesium, as well as other essential elements. When CALiMAGic is used as a supplement, it helps prevent plant deficiencies, enhances plant performance, and boosts plant productivity. The balanced blend of CALiMAGic has been proven to be effective in providing the ideal nutrient balance for healthy plant growth. Additionally, CALiMAGic is available in a variety of sizes, including 1 litre and 6 gallon containers.

$24.99 Loading Data
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Product details
Product Dimension: 20.32 x 20.32 x 15.24 cm
Shipping Weight: 1.36 Kg
SKU: 1216

Manufacturer: General Hydroponics

Date first available: March 03 2015
Average customer review: 4.60 out of 5 stars 5646 customer reviews
Bestsellers Rank: #1 in General Hydroponics

Christopher Pinto


June 17, 2020

Verified Purchase

From starting the growth stage with only water, adding CALiMAGic made a whole major difference in growth immediately after a few days of feeding! I was amazed! I’m sold on General Hydroponics Products!


  Appears to work, hard to say for sure though...

March 17, 2020

Verified Purchase

MJ plants seem to like it. Good size too. I’m using Advanced Nutrients 3-part pH Perfect line at 90% strength and using this calmag at 50-100% strength every water feeding for the last 3 months, just about to go into flower (feeding as: feed>water>feed>water>etc..) no micro nutrient deficiencies yet so I’ll say it’s working, but could also be from the Advanced Nutrients formula. (Remember to add calmag BEFORE your nutrient solution)
I usually feed calmag at 6.2-6.5 pH, while the pH Perfect line comes out to 6.15 every time.
Only complaint would be the seal under the cap seems to corrode a bit, like wet toilet paper, and tends to leak a couple drops when you shake aggressively, even when you screw the cap on really tight, so sometimes there’s a clean up... but like I said, no calmag deficiencies so I’ll say it works.
Also lasts a while since the recommended dosage is only 1ml/L for every stage.
Would recommend and buy again, but I may try Advanced Nutrients calmag next time for reference.

Brian D. Russell


August 21, 2020

Verified Purchase

I love CaliMagic.

I grow in coco so go through a lot of cal-mag, like a LOT. I’ve tried a few different brands but usually get deficiency or burn with others, whereas with this I don’t. I’m sure I could dial in the dose with the others, but it’s just easier for me to use this as it seems to be the right concentration for my growing medium.

Heads up, the concentration is a bit below a lot of other cal-mag supplements, in case that’s something you care about (I don’t).

My only complaint is cost.
All cal-mag supplements are way overpriced, and I’m not entirely sure why. You could buy the raw ingredients to make your own cal-mag very cheaply, or could amend the soil/coco with calcium additives and not have to use bottled cal-mag at all. But aside from that it works well for me.



July 19, 2016

Verified Purchase

My first time growing DWC hydro I ran into deficiency problems with my plant and I couldn't understand why since I had been so meticulous about the procedure. Turns out the reverse osmosis water that I thought the cleaner the better actually had stripped out allot of the minerals and elements that a basic plant needed. So with this product I re-introduced the Cal Mag and boom just in a few hours the plant had perked up and by next day the stems and leaves had return to there normal green. I have used it all the way into flowering and never saw the plant falter again. This bottle to me is good insurance

Happy Camper!


June 02, 2021

Verified Purchase

I like that this will buffer my coco coir without adding a lot of nitrogen. My coir is well washed, with low EC, but still has quite a bit of sodium & potassium bonded to the cation exchange sites that washing won’t clear, (up to 55% of the sites, combined). Calcium & Magnesium have stronger charges than sodium & potassium & will displace them. I’d rather have Calcium & Magnesium available for plants than Sodium & Potassium. So this will be fun!

Am making a base container mix and want to control nitrogen separately for a variety of specific crop needs.

Dr. Curmudgeon


May 05, 2017

Verified Purchase

I spent months watching a couple Numex Twilight ornamental pepper plants do essentially nothing. With occasional leaf die-offs. Someone suggested a Ca-Mg supplement, so I gave it a shot. In less than a week, both plants were covered with blossoms, nearly all of which successfully pollinated, resulting in a splendor of multicolored chilis.

Since then, I've taken to using this on all my nightshades, always to great success. Except for the barely sprouted Jalapeno plant that ended up growing a pepper that's taller than the plant it's on. Maybe too soon there.

dr saggitarious


September 30, 2016

Verified Purchase

Proper nutrition for tomatos and peppers is important. This provides a serving of both. I didn't kill any of my plants. Two and a half teaspoons to five gallons of water. From weeks 5-12. I made sure to have blossom end rot spray before I got this. BER needs to be addressed immediately and the foliar spray made from calcium nitrate I got for a dollar at home depot works wonders for a quick calcium fix. This product provides calcium and magnesium while not seeing any improvements my plants didn't get BER.



February 21, 2022

Verified Purchase

Processed like reverse osmosis and distillation removes all the minerals and salts from your water. This can be super handy because then you can control the levels your plants are receiving.

That said, if you are researching and someone says to add just pHed water, you need to confirm if they are using tap water or ro. Tap water likely won't need calmag, but RO water will need this otherwise vital nutrients are missing that would normally be present.

Some food for thought



February 03, 2020

Verified Purchase

First two pictures are my first attempt at growing microgreens (Speckled Pea). Didn’t know about adding CalMag until day 11 - picture is at day 15. Tray on right was also over-seeded.

3rd picture is my second attempt. Used CalMag in distilled water for bottom watering once roots started to grow through the tray. Also added fan for air circulation on day 7. Even before the fan, drastic difference between batch 1 and 2. Better growth all around, and leaves opened up a lot sooner.



May 28, 2018

Verified Purchase

We made some raised beds this summer needing more space. Our soil wasn't the greatest. Plants, tomatoes, cucumbers, peppers, etc. were not looking like the plants in my regular gardens. I ordered the Calmag and used it several times on all gardens. Every thing took off. I noticed my egg plant today and thought "I have never grown one this big'. I used it in my regular garden, also. Now we've had to put more staking in to hold up tomatoes. This is great supplement for gardens.

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