Aptus CaMg-Boost - Calcium and Magnesium Supplement for Firmer Flowers and Fruit
Best for: coco and hydro growers running Aptus All-in-One Liquid who need to cover typical calcium and magnesium shortfalls in those media.
Our thoughts
Cal-mag deficiencies are one of the most common issues we hear about from coco and hydro growers, and this is Aptus's answer to it. It is genuinely simple to dose and leaves no residue in your irrigation lines, which matters if you are running drippers. Just watch what else you are dosing alongside it, since calcium and phosphorus mixed at high concentrations can cause precipitation.
CaMg-Boost is an organo-mineral booster that supplies organic nitrogen alongside calcium, magnesium and L-amino acids, aimed at preventing the calcium and magnesium deficiencies that are especially common in coco and hydro setups where the growing medium does not naturally buffer these elements the way soil does. Beyond preventing deficiency, the added calcium and magnesium help firm up flower and fruit structure and support chlorophyll production and photosynthesis.
It is fully water-soluble and leaves no residue in irrigation lines, which is particularly useful in drip or recirculating systems where residue build-up can clog emitters over time.
How it compares
Cal-mag supplements are a near-universal add-on in coco and hydro growing, regardless of nutrient brand.
- Compared with generic "Cal-Mag" products sold by brands like General Hydroponics or Botanicare, CaMg-Boost adds L-amino acids into the mix rather than supplying calcium and magnesium alone.
- Against Canna's Cal Mag Agent, both aim to solve the same coco/hydro deficiency issue, with CaMg-Boost designed specifically to pair with Aptus's own All-in-One Liquid.
- Compared with using a higher-cal-mag base nutrient instead of a separate supplement, CaMg-Boost gives more precise control over how much extra calcium and magnesium you are adding on top of your base feed.
It fills the same gap most cal-mag products fill, with Aptus's own amino acid blend as the point of difference.
Usage guidance
Dosing depends on which growing medium you are running.
Soil
Use CaMg-Boost once a week rather than at every watering.
Coco and hydro
Use in combination with All-in-One Liquid at every watering, since these media typically need the extra calcium and magnesium more consistently.
Dosage rate
Use 2.5 to 5ml per 10 litres of water, shaking well before use.
Combining with other products
Do not add other phosphorus-based boosters alongside CaMg-Boost except other Aptus products, and add calcium and phosphorus sources separately, diluting and mixing one fully before adding the other to avoid precipitation.
Technical specifications
- Format: Liquid concentrate
- Contains: Organic nitrogen, calcium (Ca), magnesium (Mg), L-amino acids
- Dosage: 2.5-5ml per 10 litres of water
- Soil frequency: Once per week
- Coco/hydro frequency: Every watering, combined with All-in-One Liquid
- Solubility: 100% water-soluble, leaves no residue
- Compatibility note: Avoid mixing directly with phosphorus boosters from other brands
Who this is for
- Coco and hydro growers running Aptus All-in-One Liquid as a base feed
- Growers seeing early signs of calcium or magnesium deficiency
- Anyone running drip or recirculating systems who needs a residue-free supplement
- Growers wanting firmer, better structured flowers and fruit going into harvest
Our take
CaMg-Boost solves a genuinely common problem in coco and hydro growing, and it does it cleanly without gumming up your irrigation lines. If you are running All-in-One Liquid on anything other than soil, this is close to a default addition rather than an optional extra.
Simple, effective, and priced sensibly. One we sell a lot of for new growers.
