Is there nitrogen in this? It would be helpful for the seller to post the bottle back side label.

Hey there, good idea on posting the labels, adding that to my to-do list! To answer your question, yes there is Nitrogen. Here is the guaranteed analysis of nutrient content on our Cal-Mag. Total Nitrogen 2%, 2% Nitrate Nitrogen, Calcium 2%, Magnesium 0.6%, Boron .002%, Copper .003%, iron .004%, Manganese .004%, Zinc .004%. Derived from: Calcium Nitrate, Magnesium Nitrate, Boric Acid, Copper Sulfate, Ferric Sulfate, Manganese Sulfate, Zinc Sulfate. Hope that helps! James - Bloom City Crew

Site says it is compatible with all growth mediums, but bottle says for hydroponic use ONLY. Which is it?

That terminology on the bottle is unfortunately a labeling requirement placed on us by regulators. It is compatible with all growing mediums, including soil, cocoa coir, peat, hydroponic systems, etc. Thanks, James - Bloom City Crew

Can this be mixed with epsom salt for additional magnesium as a foliar spray or added as a root drench?

Hi, Great question. It can be added to epsom salt in a water solution, however we suggest you try this Cal-Mag first on the plants - its probably more than enough magnesium. We use highly bio-available mineral forms and add organic acids to the product to increase uptake. Its also great as both a foliar spray and a root drench! Let us know how the plants grow!

What would be the salt in ppm per dose added to ro or distilled water?

Hi, thanks for the question! The PPM added would be about 120 for the low dose of 2ml per gallon, and 240 for the high dose of 4ml per gallon. Let us know if you have any other questions! James - Bloom City Crew

Bloom City Professional Grade Ultra Pure Cal Mag Growing Fertilizer

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VT27817

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Description

🌿 Elevate your garden game with Bloom City’s pure Cal-Mag power!

MADE IN THE USA - Crafted with care domestically, ensuring premium quality and reliability.
PURE POWER BOOST - Ultra-pure Cal-Mag formula fuels vigorous plant growth and resilience.
DUAL NUTRIENT SYNERGY - Calcium and magnesium work together to strengthen stems and optimize photosynthesis.
EFFORTLESS APPLICATION - Ready-to-use liquid form mixes easily—no powders, no hassle, just pour and grow.
VERSATILE GROWTH PARTNER - Perfectly formulated for both soil gardens and cutting-edge hydroponic setups.

Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer delivers a potent 128 oz liquid formula designed to correct calcium and magnesium deficiencies, supporting robust plant structure and enhanced nutrient uptake. Ideal for both soil and hydroponic systems, this USA-made fertilizer ensures steady, healthy growth for all plant stages with easy, no-fuss application.

Specifications

ASIN	B073ZP47ZN
Best Sellers Rank	#2,038 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #109 in Garden Fertilizers
Brand	Bloom City
Brand Name	Bloom City
Coverage	Full
Customer Reviews	4.6 out of 5 stars 6,811 Reviews
Item Form	Liquid
Item Weight	128 Ounces
Liquid Volume	1 Gallons
Manufacturer	Bloom City
Mixing Ratio	2-4 mL per gallon (vegetative stage), 3-5 mL per gallon (bloom)
Model Number	Cal-Mag UltraPure \| Plus Micros
Number of Items	1
Number of Packs	1
Part Number	BCALMAG1G
Target Species	Houseplants, Greenhouse Plants, Edible Plants (fruits and veggies), Trees, Turf
UPC	841401125158
Unit Count	128 Ounce

Reviews

J**W

26.03.2026

G**E

12.06.2025

R**Y

27.03.2026

A**R

17.01.2026

J**N

27.03.2026

M**D

10.04.2026

M**Y

18.09.2025

A**R

2.03.2026

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VT27817

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