Advanced Nutrients pH Perfect Sensi Bloom Part A – 1 Liter

Advanced Nutrients pH Perfect Sensi Bloom Part A is a two-part base nutrient concentrate formulated for the flowering stage in hydroponic gardens. The 1-liter bottle covers weeks 1 through 7 of bloom at 4 mL per liter of reservoir water. Its pH Perfect Technology automatically maintains the nutrient solution within the optimal absorption range, removing the need for manual pH testing and adjustment during the bloom cycle.

Advanced Nutrients Sensi Bloom Part A Specifications

All specifications are sourced from the supplier listing, product research, and brand documentation for SKU 6101-14.

Why Choose Advanced Nutrients Sensi Bloom Part A

The following points are derived from the supplier’s product description and research data for pH Perfect Sensi Bloom.

• Automatic pH management during bloom. pH Perfect Technology adjusts the reservoir from as high as 8.7 or as low as 4.8 to the optimal absorption range of approximately 5.5. Growers who currently spend time checking and dosing pH-up or pH-down every feeding can eliminate that step entirely, provided the nutrient mix uses exclusively Advanced Nutrients products in the reservoir.
• Two-part system allows ratio flexibility. Because nitrogen (Part A, NPK 3-0-0) and the phosphorus-potassium profile (Part B, NPK 2-4-8) are in separate bottles, growers can adjust the ratio of Part A to Part B to suit specific plant varieties, growing media, or mid-cycle crop conditions. A one-part bloom nutrient does not offer this kind of per-element control.
• 20 L-form amino acids in every feeding. Part A contains a complex of 20 L-form amino acids, including L-Tryptophan, which the plant can use directly for protein synthesis, hormone production (including IAA from L-Tryptophan), and essential oil production. L-form amino acids are the biologically active isomers that plants metabolize most efficiently, compared to DL-form synthetic amino acid blends.
• Humic and fulvic acids improve chelation and nutrient transport. Leonardite-sourced humic acid in Part A adds a secondary chelation buffer and contributes to pH stability in the medium. Fulvic acids serve as natural transport molecules, helping carry micronutrients through the root cell membrane more efficiently. Both are included within the Part A formula rather than as separate add-on products.
• Wet Betty surfactant enhances nutrient delivery. The non-ionic Wet Betty surfactant reduces surface tension in the nutrient solution, which improves root uptake and foliar coverage when applicable. This is a built-in feature of the formula rather than a separate wetting agent purchase.
• Addresses 16 plant elemental needs. The full Sensi Bloom two-part system (A + B combined) provides nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, chlorine, copper, iron, manganese, molybdenum, zinc, and additional trace elements to cover the complete mineral nutrition requirement for flowering plants.

Best Uses for Advanced Nutrients Sensi Bloom Part A

Sensi Bloom Part A is designed specifically for the bloom and flowering phase in hydroponic growing systems. The use cases below reflect the described application sites and the two-part system’s positioning in the product research.

• Primary bloom-phase base nutrition in recirculating hydroponic systems. Sensi Bloom Part A (always used with Part B) is intended as the complete base nutrient solution during weeks 1 through 7 of the flowering cycle. It is not a supplement or additive; it is the foundational feed that supplies the plant’s full mineral spectrum during bloom. Recirculating systems such as DWC, NFT, and ebb-and-flow are the primary target environments.
• Grows managed without a pH meter. For growers who want to reduce the tools and testing steps in a hydroponic workflow, Sensi Bloom Part A’s pH Perfect Technology makes it practical to run a bloom cycle without frequent manual pH checks. The auto-adjustment feature does require exclusive use of Advanced Nutrients products in the reservoir; adding third-party nutrients can interfere with the buffering system.
• High-value flowering crops where amino acid availability matters. The 20 L-form amino acid profile in Part A is most relevant for crops where terpene and essential oil expression, dense floral structure, or specific aromatic compounds are production goals. The L-Tryptophan component supports auxin production (IAA), which plays a role in lateral branching and flower site development.
• Hydroponic gardens with diverse media types. Sensi Bloom is documented as compatible with rockwool, clay pebbles, coco coir, perlite, and other common hydroponic media, in addition to all major system types. Growers who run multiple media types across a garden can use a single base nutrient line rather than reformulating by media.
• Growers pairing with Advanced Nutrients boosters and additives. The pH Perfect system is designed to function as a complete ecosystem. Growers already using Advanced Nutrients additives like Big Bud, Overdrive, or Bud Candy can integrate Sensi Bloom Part A and Part B directly without compatibility concerns, while maintaining the pH auto-adjustment function.
• Commercial and home growers who need multiple bottle sizes. The 1-liter size covered here is suitable for home growers and small commercial operations. The product is available in 500 mL, 4 L, 10 L, and 23 L sizes, allowing the same formula to scale from a single DWC bucket up to a large recirculating system without switching brands or adjusting application ratios. If you are setting up a complete controlled-environment grow, a grow tent is a common pairing for growers starting with a contained hydroponic setup before expanding.

Sensi Bloom Part A vs General Hydroponics Flora Series

The General Hydroponics Flora Series (FloraGro, FloraMicro, FloraBloom) is the most widely used multi-part base nutrient system in the hobby and commercial hydroponic market. It is the most direct comparator to Sensi Bloom in terms of function (a multi-bottle base system used across the full growth cycle). The practical differences are as follows:

The primary decision between these two systems comes down to pH management preference and additive ecosystem. Sensi Bloom Part A is the better choice for growers who want to minimize manual pH work and are committed to the Advanced Nutrients product ecosystem. The GH Flora Series suits growers who mix third-party additives, run soil alongside hydro, or prefer a lower base cost with manual pH control. Both systems are proven at commercial scale; the differentiation is workflow and formula complexity rather than fundamental efficacy.

Compatibility & Operating Range

Sensi Bloom Part A is formulated for use in liquid-feed hydroponic systems. The following compatibility notes are derived from the supplier description and research data.

• System types: Documented for use in aeroponics, drip irrigation and emitters, nutrient film technique (NFT), flood and drain (ebb and flow), and deep water culture (DWC). The product label specifies “all continuous liquid-feed growing systems,” which covers recirculating, run-to-waste, and hybrid configurations. It is not formulated for top-dress or dry soil application.
• Growing media: Compatible with diverse hydroponic growing media as stated in the product description. This includes rockwool, clay pebbles (hydroton/LECA), perlite, coco coir used as a hydroponic medium, and similar inert substrates. The formula is not designed for buffered soil mixes where humic acid content and CEC of the medium interact unpredictably with the pH Perfect buffering system.
• pH Perfect Technology constraint: The auto-pH feature functions correctly only when Advanced Nutrients boosters and additives are used exclusively in the reservoir. Adding products from other manufacturers can disrupt the chelation balance and pH buffering mechanism, which may prevent the auto-adjustment from reaching the target range. Growers using third-party additives alongside Sensi Bloom Part A should plan to monitor and adjust pH manually as they would with any standard nutrient line.
• pH range corrected: pH Perfect Technology is documented to correct a reservoir pH as high as 8.7 or as low as 4.8 to approximately 5.5. It does not function as a buffer against extreme drift caused by CO2 degassing or large evaporation events; growers in hot climates or running high-evaporation systems should still verify reservoir stability periodically.
• Water source: Suitable for use with municipal water, well water, and RO water. Very soft water (near-zero alkalinity) may affect the buffering capacity of the pH Perfect system; Advanced Nutrients recommends using the product as formulated rather than pre-treating water to extreme softness before mixing.
• Grow lights: Sensi Bloom Part A is a nutrient formula and has no direct light compatibility constraint. Growers running high-output lighting during bloom—such as a 600W ceramic HPS grow light—should account for the corresponding increase in plant transpiration and nutrient uptake rate when setting reservoir EC targets.
• Temperature: Store in a cool location; avoid freezing. Liquid concentrate is susceptible to precipitation if frozen. Reservoir temperature should remain within the standard hydroponic range (65–72°F / 18–22°C) for optimal nutrient uptake; temperatures above 75°F increase dissolved oxygen depletion and may affect chelation stability.
• Part B required: Part A alone does not provide a complete bloom nutrition profile. It must always be used together with Sensi Bloom Part B (NPK 2-4-8) at equal dose rates. Running Part A without Part B produces a nitrogen-heavy, phosphorus-deficient feeding solution that is not appropriate for the bloom stage.

Dosing Guidelines

Sensi Bloom Part A is a liquid concentrate dosed in milliliters per liter of reservoir water. The following dosing information is sourced from the product research data and supplier listing.

Volume reference for the 1-liter bottle: At 4 mL per liter of reservoir water, a 1-liter bottle of Part A provides enough concentrate for 250 liters (approximately 66 US gallons) of nutrient solution. For a 20-liter DWC reservoir refreshed weekly, one 1-liter bottle of Part A covers approximately 12 reservoir fills. Growers with larger reservoirs or more frequent top-offs will need the 4-liter or 10-liter sizes.

EC targets: The product description does not specify target EC ranges per week. Growers should calibrate EC to their specific crop, strain, and system. As a general guideline for bloom-phase recirculating hydroponics, EC is typically run between 1.6 and 2.4 mS/cm during peak flower development, with reduction toward the end of the cycle. Verify with a calibrated EC meter; do not rely solely on the dose rate to estimate nutrient concentration.

Always add Part A and Part B separately to the reservoir, not pre-mixed in a concentrated stock solution. Mixing concentrated A and B together before dilution can cause precipitation of calcium and sulfate compounds. Add each part to the reservoir water individually and stir between additions.

How to Mix and Use Sensi Bloom Part A

Sensi Bloom Part A is straightforward to use in any liquid-feed hydroponic system. The steps below follow standard hydroponic nutrient mixing practice and reflect the product’s intended use as documented in the supplier and research data.

1. Fill your reservoir with fresh water. Start with clean water at the target reservoir volume. If using RO water, ensure the base EC is at or near zero before adding nutrients. Municipal water with measurable alkalinity is acceptable; the pH Perfect system is designed to correct from a range of starting pH values.
2. Shake the Part A bottle before measuring. Liquid nutrient concentrates can stratify during storage. Invert and gently agitate the bottle before drawing any concentrate to ensure the amino acid complexes, humic acids, and chelated mineral elements are uniformly suspended.
3. Measure Part A concentrate. Use a calibrated syringe or measuring pipette to draw 4 mL of Part A per liter of reservoir water. For a 100-liter reservoir, that is 400 mL of Part A. Add the measured concentrate to the reservoir water and stir thoroughly before adding Part B.
4. Measure and add Part B separately. Measure 4 mL of Sensi Bloom Part B per liter of reservoir water. Add to the reservoir water after Part A has been fully mixed in. Do not pre-mix Part A and Part B together at concentrate strength; the calcium in Part A and the sulfates in Part B can precipitate when combined at high concentration. Diluting each into the reservoir separately prevents this.
5. Mix any Advanced Nutrients additives last. If your program includes bloom boosters or other AN additives, add them after Part A and Part B are dissolved. Follow the individual additive’s dose rate and mixing sequence instructions.
6. Check EC. After mixing, measure the reservoir EC with a calibrated meter. Adjust the overall volume or concentrate dose if EC is outside the target range for the current bloom week. EC is the most reliable indicator of total dissolved nutrient concentration.
7. Allow pH Perfect to equilibrate. The pH auto-adjustment does not necessarily occur instantaneously after mixing. Allow the reservoir to circulate for 15–30 minutes after all nutrients are added before taking a pH reading. If you are verifying the system is working, a pH within approximately 0.2 units of 5.5 after equilibration confirms the technology is functioning in your water chemistry.
8. Refresh the reservoir regularly. For recirculating systems, drain and replace the full reservoir on a schedule appropriate to your system size and plant load, typically every 7–14 days. Top off between full changes with plain water to compensate for evaporation; add a small measured amount of Part A and Part B only if EC drops significantly below target.
9. Discontinue one week before harvest. Do not apply Sensi Bloom Part A or Part B during the final week before harvest. Run a plain water flush or use an Advanced Nutrients flushing product if desired for the final pre-harvest interval.
10. Store the concentrate correctly. Cap the bottle securely after each use. Store away from freezing temperatures and direct sunlight. The concentrate is a liquid chelated mineral solution; freezing can disrupt chelation and alter the effective nutrient composition. For growers who store nutrients in a garage or shed, consider a sealed storage container to protect concentrates from temperature swings and contamination between grow cycles.

Sources & Further Reading