Mad Farmer Cal+Mag, 6 gal

Calcium and Magnesium Supplement for Deficiency Prevention, 6gal

Calcium and magnesium shortfalls show up fast in RO water and coco coir systems, since both the water source and the growing medium start out low in these two elements, and by the time symptoms such as blossom end rot appear the crop has already lost ground. Mad Farmer Cal+Mag is a calcium, magnesium, and iron supplement built from calcium nitrate, magnesium nitrate, and iron EDTA, formulated to be added at every feeding so the deficiency never gets the chance to start.

This 6gal size is built for larger or commercial operations that add Cal+Mag to every feeding and need a bulk supply on hand.

Key Features & Benefits

• Calcium, Magnesium & Iron Blend — built from calcium nitrate, magnesium nitrate, and iron EDTA for readily available uptake.
• Formulated for RO Water & Coco Coir — recommended for water sources and media that run naturally short on calcium and magnesium.
• Helps Prevent Blossom End Rot — supports a steady calcium supply through the feeding cycle instead of correcting a deficiency after symptoms appear.
• No Added Dyes — formulated without dyes, so the mixed solution stays easy to check for clarity.

Who Should Use Mad Farmer Cal+Mag

Growers running RO water, coco coir, or other calcium- and magnesium-poor media who want to add Cal+Mag to every feeding rather than reacting to a deficiency once it shows up.

About Mad Farmer

Mad Farmer's nutrient and additive line includes Be One, Cal+Mag, Get Down, and Mother Of All Bloom, covering vitamin B1 support, calcium and magnesium supplementation, pH adjustment, and a concentrated bloom booster. Cal+Mag is formulated to run alongside any of those products, or any other nutrient brand, throughout the feeding cycle.

Frequently Asked Questions

When should I use Cal+Mag?

Add it to every feeding, particularly when you're running RO water or coco coir, since both tend to run short on calcium and magnesium on their own. Treating it as a standing part of the feeding schedule, rather than only reaching for it after deficiency symptoms appear, keeps calcium and magnesium levels steady through the whole cycle.

What deficiencies does Cal+Mag help prevent?

It's formulated to prevent calcium and magnesium deficiency disorders, including blossom end rot, by keeping both elements available at every feeding. Steady calcium supply matters most during periods of rapid growth, when demand for it rises fastest.

Can Cal+Mag be applied as a foliar spray?

Yes, it can be mixed into the nutrient reservoir or applied as a foliar spray. Foliar application gives a faster response once a deficiency has already become visible on new growth.

Will Cal+Mag work with my existing nutrient program?

Yes, it's compatible with any nutrient brand and growing medium, since it's designed as an add-on supplement rather than a standalone base feed. It layers into an existing feeding schedule without requiring a switch to a different nutrient line.

Which size should I buy?

The 1qt size suits home growers dosing a smaller number of plants, while the 6gal size is built for larger or commercial operations that add Cal+Mag to every feeding. The right choice mostly comes down to how many plants are on a Cal+Mag-supplemented schedule and how often you want to reorder.