Advanced Nutrients Sensi Bloom A&B — pH Perfect Two-Part Bloom Nutrient for Hydroponics
Best for: Growers running hydroponic systems who want automatic pH management and consistent flowering results without daily adjustments
Our thoughts
Sensi Bloom is solid kit that's been doing the job for growers for years. The pH Perfect technology actually works and saves you real time—no daily pH babying. It's pricier than some alternatives, but that convenience and the track record are worth it if you're running multiple systems or just want one less thing to worry about.
Advanced Nutrients Sensi Bloom A&B is a complete two-part base nutrient designed specifically for the flowering phase of hydroponic growing. What sets it apart is pH Perfect® technology — it automatically balances your nutrient solution to the optimal pH range and keeps it stable for up to seven days. That's the real win here. No pH testing kits, no constant adjustments, no guesswork. Just mix, feed, and get on with it.
The formula itself is built around a precise NPK ratio tailored for flowering (Part A: 3-0-0, Part B: 2-4-8), plus humic and fulvic acids for better nutrient transport, amino acids for protein synthesis, and an organic wetting agent to help roots absorb nutrients more efficiently. It works across all hydroponic systems—DWC, NFT, flood and drain, drip irrigation, aeroponics—and also functions in soil and coco if you're running mixed setups.
How it compares
In the premium two-part bloom nutrient space, Sensi Bloom sits in the mid-to-upper tier, positioned firmly above entry-level options but below the Connoisseur line.
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vs. General Hydroponics Flora: GH FloraDuo is cheaper and more flexible (easier to adjust ratios), but you're managing pH manually and it lacks the amino acid / humic acid boost
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vs. CANNA Aqua Flores: CANNA is precision-focused and Dutch-engineered, but comes at similar cost with no automatic pH management
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vs. Athena (market leader): Athena dominates UK sales and is beginner-friendly, but Sensi's pH Perfect technology is a genuine time-saver if you value convenience
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Real-world feedback: Experienced growers report running Sensi at 50–75% recommended strength with excellent results, meaning one bottle stretches further than the label suggests
The premium you pay here is for the pH Perfect system and proven consistency. You're not buying hype—you're buying fewer daily chores.
Usage guidance
Sensi Bloom is mixed and dosed the same way regardless of your system type, though application varies slightly.
Standard dosing (hydroponic systems)
Mix at 4 ml/litre of Part A and 4 ml/litre of Part B during the flowering phase (typically weeks 1–7 of bloom). Use reverse osmosis (RO) water or water with EC below 160 µS/cm (approximately 100 ppm) for the pH Perfect technology to work optimally.
Important: The pH Perfect system only works if you add only Advanced Nutrients products to your reservoir. Adding third-party boosters or additives will disable the automatic pH balancing. This is a key limitation to understand upfront.
Dosing reality check
Manufacturer guidance is 4 ml/L, but real-world grower feedback shows that 50–75% of this dose (2–3 ml/L) delivers excellent results without nutrient burn. Start conservative, observe plant response, and adjust upward only if needed. This also makes the bottle stretch further—a practical money-saver.
Reservoir management
Mix a fresh reservoir and run it to depletion or seven days, whichever comes first. Most growers report minimal maintenance once mixed—the pH stays stable, EC stays stable, and you focus on environmental factors instead of chemistry.
Compatibility
Works in all hydroponic systems (DWC, NFT, flood and drain, drip, aeroponics) and also functions in soil, coco, and rockwool if you're building a hybrid setup.
Technical specifications
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Product type: Two-part liquid base nutrient for flowering phase
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NPK – Part A: 3-0-0
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NPK – Part B: 2-4-8
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Key ingredients: Humic acid, fulvic acid, amino acid complex, organic wetting agent
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pH Perfect® range: Maintains solution pH within optimal range for up to seven days
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Recommended dosage: 4 ml/litre each (A & B), though 2–3 ml/litre common in practice
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Ideal water EC: Below 160 µS/cm (approximately 100 ppm) for pH Perfect effectiveness
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Available sizes: 1 litre (Part A & B individually) and 5 litre (Part A & B individually)
Who this is for
- Growers running multiple hydroponic systems where daily pH management becomes a time sink
- First-time hydroponic growers who want reliable results without learning curve on pH chemistry
- Experienced growers who've used Sensi before and know the track record
- Anyone currently managing pH manually and ready to eliminate that chore
- Growers who want proven performance and don't mind paying for convenience and consistency
Less suited to: Budget-conscious growers (General Hydroponics Flora is cheaper), growers who want flexibility to mix third-party additives, or those running extremely large commercial operations (where other brands may offer volume discounts).
Our take
Sensi Bloom is genuinely good kit. The pH Perfect technology isn't marketing fluff—it saves real time and removes a genuine source of stress, especially if you're juggling multiple reservoirs. The formula delivers consistent flowering results, and long-term growers report running it for a decade without switching.
It's pricier than some alternatives, but you're paying for proven performance and the convenience of not touching a pH meter for a week. Dial the dose back to 50–75% and you'll save money while avoiding nutrient burn. Worth picking up if you value reliability and want feeding sorted while you focus on environment and genetics. Good time to buy while stock lasts.
