Advanced Nutrients Sensi Cal-Mag Xtra – 1L

Advanced Nutrients Sensi Cal-Mag Xtra is a 1-litre calcium, magnesium, and iron supplement designed for hydroponic and soil growers who are running a non-Advanced Nutrients base nutrient program. It fills the Ca, Mg, and Fe gaps that most third-party base nutrients leave open, helping prevent the deficiency symptoms that slow growth and reduce yields at every stage of the crop cycle.

Advanced Nutrients Sensi Cal-Mag Xtra 1L Specifications

Key technical specifications for Advanced Nutrients Sensi Cal-Mag Xtra 1L based on manufacturer documentation and available product data.

Specification	Value
Brand	Advanced Nutrients
Product Name	Sensi Cal-Mag Xtra
Container Volume	1 Litre (1L)
Primary Nutrients Supplied	Calcium (Ca), Magnesium (Mg), Iron (Fe)
Product Type	Liquid concentrate nutrient supplement
Shipping Weight	3.9992 lb (approx. 1.81 kg)
Intended Use	Supplement for use with non-Advanced Nutrients base programs
Growth Stage Applicability	All stages (vegetative through bloom)

Why Choose Advanced Nutrients Sensi Cal-Mag Xtra 1L

Calcium, magnesium, and iron are three of the most commonly deficient secondary and micronutrients in high-intensity hydroponic environments. Most base nutrient brands—particularly those not formulated under the Advanced Nutrients system—do not supply these elements in sufficient concentrations or in the chelated forms that plants absorb most readily. Sensi Cal-Mag Xtra is designed specifically to close that gap.

The product addresses a straightforward reality of crop nutrition: different plants at different stages of development have different elemental requirements. Young plants building cell walls and ramping up photosynthetic capacity have a high demand for calcium and magnesium. Failing to meet that demand leads to visible deficiency symptoms—tip burn, interveinal chlorosis, stunted new growth—that most growers attribute to pH fluctuations before identifying the actual cause.

What separates Sensi Cal-Mag Xtra from generic cal-mag products is the inclusion of iron in specific forms at precise ratios. Iron deficiency in high-value crops is frequently overlooked because symptoms can resemble magnesium deficiency at first glance. By supplying all three elements together in a formulation calibrated for hydroponic conditions, this supplement simplifies the correction process rather than requiring growers to manage separate iron chelate additions.

• Addresses the three most commonly deficient elements in non-Advanced base programs: calcium, magnesium, and iron.
• Formulated for precise iron delivery — the canonical description notes “specific forms of iron in precise ratios,” which distinguishes this from basic cal-mag supplements that omit iron entirely.
• Applicable across the full crop cycle — calcium and magnesium requirements are elevated at every growth stage, not only during bloom, making this a consistent line-item in any nutrient schedule.
• Targets growers using third-party base nutrients — if you are running a base program from another brand, your crops may already be receiving sub-optimal Ca, Mg, and Fe levels; Sensi Cal-Mag Xtra is the direct correction.
• Liquid concentrate format — easy to measure and integrate into existing reservoir fill routines without additional mixing equipment.

Best Uses for Advanced Nutrients Sensi Cal-Mag Xtra 1L

This supplement is best deployed as part of a structured nutrient program rather than as a reactive treatment after deficiency symptoms appear. The following situations represent the most common and appropriate applications based on the product’s stated purpose.

• Running a non-Advanced Nutrients base nutrient program. The core use case, as stated in the product description: if your base nutrient brand is not Advanced Nutrients, your crops are likely not receiving the Ca, Mg, and Fe concentrations that high-value crops require. Adding Sensi Cal-Mag Xtra to your reservoir from the start of each feeding cycle is the preventative approach.
• Hydroponic systems with soft or reverse-osmosis water. RO water and soft municipal water supplies are stripped of naturally occurring calcium and magnesium. Growers using RO water as their base must supply 100% of Ca and Mg through their nutrient program. Sensi Cal-Mag Xtra is well-suited to filling this role alongside any base nutrient line.
• Coco coir cultivation. Coco coir is a calcium- and magnesium-hungry medium that binds Ca and Mg ions, making those elements less available to plant roots than in other media. Growers using coco as their growing medium routinely supplement with additional Ca and Mg above the levels supplied by their base nutrients, and a dedicated supplement like Sensi Cal-Mag Xtra handles this need directly.
• Correcting early-stage deficiency symptoms. If you observe tip burn on new leaves (calcium), interveinal yellowing on older leaves (magnesium), or yellowing between leaf veins on young growth (iron), integrating this supplement at a corrective dose can arrest the progression. However, verify that root zone pH is within the acceptable range before adjusting nutrient inputs, since pH lockout can mimic deficiency symptoms.
• High-intensity lighting environments. Plants under high-intensity LEDs or HID fixtures have elevated metabolic rates and corresponding increases in calcium and magnesium demand. Growers running modern high-output lighting often find that standard base nutrient recommendations underdeliver Ca and Mg relative to actual plant uptake rates at those light levels. A supplemental source like this one helps maintain adequate supply.
• Transition weeks between vegetative and bloom phases. The shift from a vegetative to a bloom nutrient formula sometimes creates a temporary reduction in Ca and Mg delivery, especially if the bloom base is lower in those elements. Maintaining Sensi Cal-Mag Xtra throughout the transition avoids the brief deficiency window that can occur during this formula change.

Compatibility

Sensi Cal-Mag Xtra is a liquid nutrient supplement intended for use alongside any base nutrient program not formulated by Advanced Nutrients. It is compatible with a range of growing systems and media types commonly used in controlled-environment agriculture and home hydroponic setups.

Growing systems: The supplement is suitable for use in recirculating hydroponic systems (deep water culture, ebb and flow, NFT), drain-to-waste systems, and hand-watered media-based grows. Because it is a liquid concentrate, it dissolves readily when added to a reservoir or mixing tank prior to pH adjustment.

Growing media: Compatible with rockwool, coco coir, perlite, expanded clay (hydroton), and soil-based mixes. Coco coir growers in particular benefit from supplemental calcium and magnesium due to the medium’s cation exchange behavior as described above.

Nutrient program pairing: If you are already using a root colonization product such as Advanced Nutrients Tarantula to support beneficial microbial populations, adding Sensi Cal-Mag Xtra to your base program ensures that root uptake efficiency gains from microbial activity are met with adequate mineral supply. You can also pair this supplement with a molasses-based carbohydrate source like Earth Juice Hi-Brix Molasses in organic-style nutrient programs, provided you monitor EC carefully to avoid overfeeding.

pH interaction: Add Sensi Cal-Mag Xtra to your reservoir or mixing container before adjusting pH. Calcium and magnesium salts in concentrated form can slightly affect solution pH. Always measure and correct pH after all nutrients have been added and the solution is fully mixed, targeting 5.5–6.2 for hydroponic media or 6.0–7.0 for soil.

Note on use with Advanced Nutrients base nutrients: The product is specifically intended for growers not using Advanced Nutrients base formulas. If you are already running an Advanced Nutrients base program (such as Sensi Grow/Bloom or pH Perfect series), the Ca, Mg, and Fe levels in those formulas are calibrated to meet plant requirements at labeled doses, and adding Sensi Cal-Mag Xtra may result in excess levels of these elements. Consult the Advanced Nutrients feeding chart for your base program before adding this supplement.

Dosing Guidelines

Specific milliliter-per-litre or milliliter-per-gallon dose rates for Sensi Cal-Mag Xtra are not included in the canonical supplier data for this product. The following general guidance is based on standard industry practice for calcium-magnesium-iron liquid concentrates of this type. Consult the Advanced Nutrients feeding chart available on their website for the precise recommended dose for your specific program and growth stage before adding to your reservoir.

• Preventative supplementation: Most cal-mag supplements of this class are dosed between 1–5 mL per litre (approximately 4–20 mL per US gallon) depending on source water hardness and base nutrient formula. Begin at the lower end of the manufacturer’s recommended range when first introducing the product to your program.
• RO or soft water grows: Growers using reverse-osmosis water typically require a higher dose because no background calcium or magnesium is present in the source water. In these situations, running at the middle to upper end of the manufacturer’s recommended range is common practice.
• Frequency: Add with every reservoir change or at each watering for drain-to-waste systems, throughout the full crop cycle from seedling or clone establishment through the final weeks of bloom.
• EC monitoring: Add this supplement to your nutrient mix before taking a final EC reading. Calcium and magnesium salts contribute to overall solution EC. Account for their contribution when dialing in your total target EC for the growth stage.
• Corrective dosing: If addressing an active deficiency, some growers temporarily increase the dose above the preventative rate for one to two feed cycles, then reduce back to the maintenance level once new growth shows no deficiency symptoms. Do not exceed the maximum dose on the manufacturer’s feeding chart.
• Foliar application: If a deficiency is severe and root uptake is compromised (for example, by root zone pH problems), a dilute foliar spray of a cal-mag solution can provide a faster correction pathway. Follow the manufacturer’s guidelines for foliar concentration, which is typically lower than the reservoir dose, and apply during the lights-off period or in low-light conditions to reduce the risk of leaf burn.

How to Use Sensi Cal-Mag Xtra

1. Shake the bottle before use. Liquid nutrient concentrates can settle during storage. Invert and shake the 1L bottle for 15–20 seconds before measuring out your dose to ensure an even distribution of the nutrient compounds.
2. Determine your target dose. Consult the Advanced Nutrients feeding chart for Sensi Cal-Mag Xtra, available at advancednutrients.com. Identify the dose recommendation for your growth stage (early veg, late veg, early bloom, late bloom) and your source water type (RO, soft, or hard municipal).
3. Fill your reservoir or mixing container with fresh water. Start with plain, un-pH-adjusted water at your target temperature (generally 18–22°C / 65–72°F for most hydroponic crops).
4. Add Sensi Cal-Mag Xtra before other additives. Measure the calculated dose using a calibrated syringe or graduated measuring cup. Add Sensi Cal-Mag Xtra to the water and stir or recirculate briefly. Adding cal-mag early allows it to fully dissolve before other nutrient compounds are introduced, reducing the risk of precipitation.
5. Add base nutrients and remaining additives. Follow your standard nutrient mixing order for your base program. If using a root inoculant like Advanced Nutrients Tarantula, add it last after pH has been adjusted, as some live microbial products are sensitive to concentrated nutrient solutions.
6. Measure and adjust EC. Take an EC reading and compare to your target range for the current growth stage. If EC is above target, dilute with additional plain water. If below, add a small amount of base nutrients to bring it into range.
7. Adjust pH to target range. Measure pH and adjust using a pH-up or pH-down solution to reach your target: 5.5–6.2 for hydroponic media (rockwool, coco, clay pebbles) or 6.0–7.0 for soil. Always adjust pH after all nutrients are in solution.
8. Deliver to plants. Use the mixed solution immediately or within a few hours of mixing for best results. If storing in a reservoir, keep it covered and in a dark location to prevent algae growth and nutrient degradation.
9. Monitor plant response. Over the following 5–7 days, observe new growth for signs of deficiency (tip burn, chlorosis, stunted leaves). If symptoms persist or worsen, re-examine root zone pH as the primary variable before increasing the cal-mag dose, since pH lockout is the more common cause of persistent secondary nutrient deficiency in hydroponic systems.

Sources & Further Reading