Dutch Pro Original Bloom Hydro/Coco A&B Hard Water — Two-Part Bloom Nutrients for UK Growers
Best for: Growers in hard water areas running hydroponic or coco systems who want proven nutrients without the premium price tag
Our thoughts
Dutch Pro's been making nutrients for 30 years, and it shows. The hard water formulation is properly thought out for UK water conditions — something most competitors just ignore. This is the kind of nutrient that does the job quietly, no faffing about with pH Perfect tech or fancy branding, just solid two-part chemistry at a price that leaves money for everything else.
Dutch Pro Original Bloom is a two-part base nutrient designed specifically for the bloom and fruiting stage of your growing cycle. This is the hard water version, which means it's optimised for UK tap water — accounting for higher calcium and magnesium levels that can cause lockout issues in standard formulations. Works seamlessly in hydroponic systems and coco mediums, giving you complete control over what your plants receive at the stage when it matters most.
How it compares
Dutch Pro sits in the smart-value middle ground of two-part bloom nutrients.
- Same functional performance as Advanced Nutrients and CANNA at a significantly lower cost
- Hard water optimisation — competitors either don't address this or charge extra for it
- 30-year Dutch heritage without paying for premium branding or packaging
- Simpler mixing than some "pH Perfect" alternatives — you run your own pH, which gives you more control
The real difference: Dutch Pro spent the money on what's inside the bottle, not what's printed on it.
Usage guidance
Dutch Pro Original Bloom works across different hydroponic and coco setups. The key is consistency and water chemistry.
Mixing and reservoir feeding
Add equal parts Part A and Part B to your reservoir or watering container — never mix them together in concentrate form. Dosage is 2.5–3.5 ml/litre of each part, depending on desired EC level. For reference, 250–300ml total per 100 litres of water hits the sweet spot. Always rinse your measuring cup between parts.
Water chemistry targets
Aim for an EC of 1.8–2.0 and a pH of 5.8 for best results. The hard water formulation accounts for higher calcium and magnesium in your tap water, so you're less likely to hit lockout issues on coco — particularly important since coco naturally buffers pH and holds onto certain salts.
Reservoir management
Refresh your nutrient solution every 7 days. This keeps EC in check and prevents nutrient imbalances from building up over time.
Hydroponic systems
Works in NFT, flood and drain, drip irrigation, deep water culture — anywhere you're running a circulating or static hydroponic setup. Equally effective hand-watering into coco pots, provided you're checking runoff and adjusting feed strength accordingly.
Complementary products
Dutch Pro recommend pairing this with their Explode bloom booster and Multi Total for added yield. Their proprietary pH Down for Bloom also works specifically with this nutrient line.
Technical specifications
- Product type: Two-part A&B base nutrient for bloom/fruiting stage
- Formulation: Hard water optimised (HW) — accounts for higher calcium and magnesium in UK tap water
- NPK ratio: 5-2-6
- Application: Hydroponic systems and coco mediums
- Dosage: 2.5–3.5 ml/litre each part A and B
- Target EC: 1.8–2.0
- Target pH: 5.8
- Nutrient solution refresh: Every 7 days recommended
- Available sizes: 1L, 5L, 10L, 20L bottles
- Contains: Full spectrum macro and micronutrients including chelated trace elements
Who this is for
- Growers in hard water areas (most of the UK) running hydroponic or coco systems
- Budget-conscious growers who want proven chemistry without paying premium brand markup
- Those switching from soil to hydroponics or coco who need simple, reliable base nutrients
- Experienced hydro growers looking to cut costs without compromising on nutrient profile
- Anyone running multiple systems where nutrient costs add up fast
Particularly well suited to growers who understand their water chemistry and prefer hands-on control over automatic pH adjustment systems.
Our take
This is what a solid two-part bloom nutrient should look like — no gimmicks, no fancy tech, just 30 years of Dutch expertise in a bottle that actually costs sensible money. The hard water formulation alone sets it apart for UK growers; it's the kind of detail most brands overlook because they're not thinking about regional water conditions.
If you're setting up a hydro or coco bloom system and don't fancy spending double on Advanced Nutrients, Dutch Pro Original Bloom is worth picking up while stock lasts. Does exactly what it should, feeds your plants properly, and leaves your budget intact for boosters and pH management. That's smart value right there.
