High-P/K dry concentrate engineered for commercial stock-tank fertigation programs.
Athena Pro Bloom (0-12-24) is a fully soluble dry-salt flower feed built for large-format commercial operations — mix it to a stock concentrate, dial in your EC, and run it through any dosing system without clogging lines or leaving sediment behind. Used alongside Athena Pro Core, it delivers a complete macro and micro-element profile from week two of flower through late bloom.
Athena Pro Bloom is the flowering-stage base nutrient in Athena's Pro Line — a three-product dry soluble system designed specifically for commercial cultivators running large stock tanks and automated fertigation. The formula carries an NPK of 0-12-24 with no nitrogen, allowing the grower to shift the nutrient ratio decisively toward phosphorus and potassium during the reproductive phase without pulling the full-cycle base formula along for the ride.
Ingredients are limited to four pharmaceutical-grade salts: Potassium Phosphate, Potassium Sulfate, Magnesium Sulfate, and Iron DTPA. That short ingredient list means predictable solubility, consistent ion ratios batch to batch, and no organic load that can foul lines or create biofilm in drip emitters. Every bag of Pro Bloom is the same product — no filler, no proprietary mystery inputs.
Pro Bloom is a commercial-scale product in its format and philosophy. It is designed for operations that mix nutrient stock concentrates — large batch tanks, automated dosing injectors, or centralized fertigation manifolds — rather than hand-mixing single reservoirs. The 25 lb bag format is the standard commercial quantity and is what most multi-light and multi-room facilities run to keep per-gallon cost as low as possible.
If your facility runs Dosatron, Netaflex, Rhythm, or any injection-based dosing setup, Pro Bloom integrates without modification. Growers on coco, rockwool, peat-based substrates, and true hydroponic systems all use the same formula — the medium doesn't change the product, only the EC and irrigation frequency targets. Athena's own feed schedules are publicly available and lay out recommended EC bands from the start of flower through the final-week taper.
The 0-12-24 NPK profile is accompanied by 9% sulfur and 3% magnesium, both derived from the sulfate salt inputs. Sulfur from potassium sulfate and magnesium sulfate contributes to secondary metabolite pathways — terpene and resin biosynthesis — without pushing pH or adding unwanted chloride load. The magnesium component supports chlorophyll integrity through the high-light, high-demand weeks of mid-flower when photosynthetic efficiency is critical to final weight.
The product is a large-grind granule that dissolves completely at room temperature with agitation — no heat required, no undissolved particulates. Athena recommends converting the dry powder to a concentrated liquid stock first before feeding batch tanks, rather than adding dry granules directly to final-volume reservoirs. This workflow gives consistent dosing accuracy and is the standard protocol on any operation running centralized nutrient delivery. Always measure by weight, not volume — the granule size can vary slightly and volume measurements introduce dosing error.
Iron is chelated as Iron DTPA at 0.1%, maintaining micronutrient availability across the pH range typical of recirculating and run-to-waste hydroponic systems. Heavy metal content is low by design — relevant for licensed cannabis operators in states with finished-product heavy-metal testing panels.
Athena Pro Bloom is not a standalone formula. It is the flowering component of a two-part-per-stage system. During flower, Pro Bloom supplies the P-K backbone while Athena Pro Core covers calcium, magnesium top-up, and the remaining micronutrient stack. The recommended ratio is 1 gram of Pro Core for every 0.6 grams of Pro Bloom (or equivalently: for every gram of Pro Bloom, use 0.6 g of Pro Core) — both metered by weight into the stock solution before injection.
The Pro Line replaces multi-bottle additive programs with two products per stage and a steady-EC feeding strategy. The concept is that total nutrient delivery to the plant is managed by irrigation event frequency and substrate dry-back management, not by ramping EC up and down through the cycle. This approach simplifies the nutrition program, reduces the number of SKUs a facility needs to stock, and gives the head grower full control over the recipe with documented, repeatable inputs. For operators looking to tighten cost-per-gram and reduce nutrient program complexity without sacrificing result quality, the Pro Line format is the standard to benchmark against.
| SKU | PRO-BL-25 |
| NPK | 0 — 12 — 24 |
| Available Phosphate (P₂O₅) | 12.0% |
| Soluble Potash (K₂O) | 24.0% |
| Magnesium (Mg) | 3.0% |
| Sulfur (S) | 9.0% |
| Iron (Fe) — chelated DTPA | 0.1% |
| Derived From | Potassium Phosphate, Potassium Sulfate, Magnesium Sulfate, Iron DTPA |
| Package Size | 25 lb bag |
| Max Stock Concentration | 2.5 lbs per 1 gallon of water |
| Solubility | 100% water-soluble — zero particulates or sediment |
| Dosing Systems Compatible | Dosatron, Netaflex, Rhythm, and injection-based fertigation |
No. Pro Bloom (0-12-24) supplies phosphorus, potassium, sulfur, magnesium, and chelated iron, but it does not cover calcium or the full micronutrient stack on its own. It is designed to run alongside Athena Pro Core throughout the entire crop cycle — Core handles calcium and the remaining micros, Bloom handles the P-K demand of the flowering stage. Running Pro Bloom without Core will result in calcium and micronutrient deficiencies.
Athena recommends mixing 4–7 grams of Pro Bloom per gallon of final nutrient solution, starting in week two of flowering. Exact grams-per-gallon will depend on your target EC and your baseline water EC. Always follow the Athena feed schedule for your substrate type and dial in from there. Measure by weight, not volume.
Athena discourages adding the dry granules directly to final-volume reservoirs. Their recommended workflow is to dissolve Pro Bloom and Pro Core into separate stock concentrate solutions first (up to 2.5 lbs per gallon of water each), then use those liquid concentrates to mix your batch tanks or feed your dosing injectors. This ensures complete dissolution and consistent dosing accuracy at scale.
When mixed correctly to a stock concentrate and then diluted, the formula is 100% soluble with no particulates or sediment. It will not clog dripper emitters, inline strainers, or dosing injector screens. The key is complete dissolution in the stock tank before injecting into your irrigation lines. Do not combine Pro Bloom and Pro Core in dry or concentrated form — mix each into water separately before combining.
The primary potassium source is potassium sulfate, not potassium chloride — so the formula does not introduce chloride load to your nutrient solution, which matters for operators whose state testing programs or internal SOPs require chloride management. The sulfate-based potassium input also contributes the 9% sulfur content in the guaranteed analysis.
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