Veg+Bloom Stax — Commercial-Grade Calcium Magnesium Powder for Concentrated Growing Power
Best for: Experienced growers and commercial operations after a concentrated, pH-stable calcium-magnesium additive that cuts shipping costs and eliminates guesswork
Our thoughts
This is proper kit for growers who understand nutrient profiles and want commercial-grade results without the premium liquid price tag. Veg+Bloom Stax consolidates multiple functions into one powder — calcium, magnesium, humic acids, and wetting agents all at once. If you're running scale and margins matter, this is worth your attention.
Veg+Bloom Stax (formerly Stackswell) is a concentrated powder nutrient additive manufactured by Hydroponic Research using pharmaceutical and food-grade components only. It's a multi-function blend of humic acids, calcium, magnesium, and carbohydrates designed to encourage faster growth, bigger yields, and stronger plant structure from early veg right through flowering. Because it's powdered, not liquid-suspended, you're paying for active nutrients, not water weight — which means significantly lower shipping costs and better value per gram than traditional liquid CalMag solutions.
How it compares
This sits in the commercial-grade, concentrated additive category, not entry-level CalMag territory.
- Powder format vs. liquid competitors = lower water content, higher concentration, easier to ship
- Pharmaceutical-grade manufacturing vs. standard hydroponic additives = consistency and purity you can rely on at scale
- 8-0-0 NPK formulation specifically designed to slot into existing nutrient schedules without disrupting balance
- Pre-blended pH buffer means you're working in 5.6–6.5 range straight out — no adjustment needed
- Replaces separate calcium, magnesium, and humic acid purchases in one product
If you've been buying liquid CalMag and powder base nutrients separately, Stax consolidates the former into one reliable powder.
Usage guidance
Veg+Bloom Stax works across all growing mediums and hydroponic systems:
Dosage
Use 1 gram of powder per 4 litres of reservoir water or nutrient solution. Start from early veg and continue through to the second week of flower. Simple as that — no complex mixing ratios.
Hydroponic systems
Works cleanly in all setups: NFT, flood and drain, drip irrigation, deep water culture. The concentrated format is particularly cost-effective when you're running multiple reservoirs or larger volumes.
Coco and soil
Compatible with both, though hydroponic growers are the primary target market. If you're running coco drip systems, this eliminates the need for separate calcium-magnesium supplementation.
Nutrient compatibility
Compatible with all hydroponic nutrient base feeds. If your base nutrients already contain NPK, reduce Stax strength slightly to avoid overload. You won't need additional CalMag products if you're using this — it does that job.
pH stability
Pre-formulated to work within a 5.6–6.5 range. Most growers report minimal pH adjustment needed once this is dissolved into solution.
Technical specifications
- Product name: Veg+Bloom Stax (formerly Stackswell)
- Manufacturer: Hydroponic Research, California
- Form: Concentrated powder
- NPK ratio: 8-0-0
- Active components: Humic acids, calcium, magnesium, carbohydrates, nitrogen
- Available sizes: 1lb (453g), 5lb (2.275kg), 25lb (11.36kg — made to order)
- pH range: 5.6–6.5 (pre-buffered)
- Manufacturing standard: Pharmaceutical and food-grade components only, batch-tested for consistency and purity
- Dosage rate: 1 gram per 4 litres
- Application window: Early veg through second week of flower
Who this is for
- Commercial-scale growers where margins and shipping logistics matter
- Experienced hydroponic cultivators looking to consolidate multiple additives into one product
- Anyone running multiple reservoirs or large-volume systems where per-gram cost efficiency pays off
- Growers who want pharmaceutical-grade nutrient consistency without compromising results
- Operations currently buying liquid CalMag and considering a powder alternative
This is not entry-level kit — it's built for growers who understand nutrient profiles and want professional-grade performance at scale.
Our take
Veg+Bloom Stax is proper concentrated nutrient powder from a manufacturer that knows what serious growers actually need. The pharmaceutical-grade quality, pH stability, and multi-function design make it a solid choice for anyone running hydroponic systems at scale. You're not paying for marketing or packaging — you're paying for active nutrients and consistency.
If you're experienced with hydroponic feeding and want to cut costs on shipping and simplify your additive shelf, this is worth looking at. Good time to pick up while stock lasts.
