General Hydroponics CALiMAGic 1 – 0 – 0 – 6 Gallon

General Hydroponics CALiMAGic™ 1-0-0 is a concentrated liquid blend of calcium and magnesium formulated to prevent secondary nutrient deficiencies in fast-growing crops. The 6-gallon container is intended for commercial growers and large recirculating systems where Cal-Mag consumption is high. It addresses blossom end rot in tomatoes and tip burn in lettuce, and it supports overall plant nutrition in any hydroponic or soilless system that runs calcium-intensive crops.

CALiMAGic 1-0-0 Specifications

Specifications below are derived from the canonical product data and manufacturer labeling. The 1-0-0 NPK ratio reflects the calcium-dominant formula with supplemental magnesium. The 6-gallon liquid format is the large commercial size.

Why Choose CALiMAGic 1-0-0

CALiMAGic is used by growers who run calcium-intensive crops in recirculating systems, where calcium and magnesium can become depleted faster than a standard base nutrient program replenishes them. Here is what makes the 6-gallon format particularly useful in a production setting:

• Prevents two common deficiency symptoms at once. Calcium deficiency causes blossom end rot in tomatoes and tip burn in lettuce. Magnesium deficiency causes interveinal chlorosis. CALiMAGic addresses both with a single supplement, reducing the number of products in your dosing routine.
• Concentrated formula. A concentrated liquid blend means a small measured dose per gallon of reservoir water; the 6-gallon jug stretches further than smaller retail sizes when you are mixing hundreds of gallons at a time.
• Readily available nutrient forms. The calcium and magnesium in CALiMAGic are formulated for immediate uptake in solution, which matters in hydroponic systems where plant roots are in direct contact with the nutrient solution rather than relying on soil chemistry to release nutrients slowly.
• Compatible with most base nutrient programs. CALiMAGic is designed to supplement rather than replace a base nutrient line. It fits alongside three-part or two-part nutrient programs used in DWC, NFT, coco, and other soilless systems.
• Commercial 6-gallon size reduces per-gallon cost. For growers running multiple reservoirs or large-scale production, buying Cal-Mag in the 6-gallon size reduces refill frequency and lowers the per-gallon cost compared to the 1-gallon or quart options.

If you are also looking to support microbial root health alongside your Cal-Mag supplementation, consider pairing CALiMAGic with a microbial inoculant such as Advanced Nutrients Tarantula, which supports root-zone biology in recirculating systems.

Best Uses for CALiMAGic 1-0-0

CALiMAGic is most valuable in situations where calcium and magnesium draw-down outpaces what the base nutrient mix supplies. The following use cases are drawn from the product description and the characteristics of calcium-intensive cropping systems:

• Tomatoes and fruiting crops showing blossom end rot. Blossom end rot is a calcium deficiency symptom that appears as dark, sunken tissue on the blossom end of the fruit. Adding CALiMAGic early in the fruiting stage can prevent this, provided the deficiency is addressed before symptoms become severe.
• Lettuce and leafy greens prone to tip burn. Tip burn in lettuce is a calcium deficiency symptom caused by inadequate calcium transport to leaf edges. It is particularly common in fast-growing NFT or DWC lettuce systems. CALiMAGic supplementation helps maintain adequate calcium levels at the leaf margins.
• Recirculating hydroponic systems (DWC, NFT, RDWC). In recirculating systems, calcium and magnesium are absorbed at different rates and the reservoir balance shifts over time. Regular Cal-Mag supplementation helps maintain stable solution chemistry between full reservoir changes.
• Coco coir media. Coco coir has a high cation exchange capacity that locks up calcium and magnesium. Growers using coco almost universally supplement with Cal-Mag from seedling through harvest, making a high-volume format like this 6-gallon jug practical.
• RO or soft-water systems. Reverse osmosis water and soft water contain very little naturally occurring calcium or magnesium. Growers using RO water rely entirely on their nutrient program to supply these elements, making a dedicated Cal-Mag supplement essential rather than optional.
• Large reservoir top-offs. When topping off large reservoirs between full changes, adding a small measured dose of CALiMAGic with each top-off maintains calcium and magnesium levels as the solution concentrates from plant uptake and evaporation.

Growers who supplement CALiMAGic alongside a comprehensive root health program may also find value in PureCrop1, a crop protection and nutrient supplement that can be used alongside standard hydroponic nutrient programs.

Dosing Guidelines for CALiMAGic 1-0-0

The following dosing guidance is based on the standard approach for liquid Cal-Mag concentrates in hydroponic systems. Always verify against the current General Hydroponics feed chart, as dose rates can vary by growth stage and base nutrient program. CALiMAGic is a liquid concentrate and should be diluted before adding to the reservoir.

• General guideline: Typical Cal-Mag supplements are dosed at 1–5 mL per gallon of reservoir or feed water, adjusted based on crop type, water hardness, and base nutrient program. Consult the General Hydroponics feed chart for CALiMAGic-specific rates.
• Add before base nutrients: When mixing a reservoir, add Cal-Mag supplements to plain water first and mix thoroughly before adding base nutrients. This helps prevent calcium-phosphate precipitation.
• Monitor EC: CALiMAGic contributes to overall EC. Account for its contribution when building to your target EC range for the growth stage. Use an EC meter to verify the mixed solution before introducing it to the system.
• Adjust for water source: Growers using RO water typically dose at the higher end of the range. Growers on municipal water with naturally high calcium and magnesium may need less supplementation or none at all—test your source water first.
• Shake or stir before use: As with all liquid nutrient concentrates, shake or stir the container before measuring a dose to ensure the solution is fully homogenous.

Sources & Further Reading