RAW Potassium – Water-Soluble Straight Element Corrective
RAW Potassium – Water-Soluble Straight Element Corrective
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Order by 3pm Mon–Fri — we aim to post same day · FREE Express Delivery over £99 · 1–2 working days · Free Wembley pickup
- 14-day returns
- Price match promise
- Free Wembley store pickup
- Advice from the team: 020 3488 0419
Description
Half potassium by weight, from a single clean source
RAW Potassium contains 50% water-soluble potash derived from potassium sulphate — the highest concentration of natural water-soluble potassium available to the home gardener. Potassium drives a wide range of plant processes, from water regulation to flower and fruit development, and is one of the elements most commonly pushed hard through flowering.
As a straight, single-element product, it lets a grower increase potassium precisely without also increasing phosphorus or nitrogen the way a blended PK booster would, which matters when a feed is already balanced everywhere except one element.
Key Benefits
- 50% water-soluble potash, the highest concentration available to home growers
- Sourced from potassium sulphate
- Corrects a potassium deficiency without shifting other elements
- Builds custom feeds alongside the rest of the RAW straight-element range
- Suits soil, coco and hydroponic systems
How to Use
- Add to the reservoir to correct a diagnosed potassium deficiency, or as part of a custom-built feed
- Vegetative weeks 1–4: 0.5 g per 4 L
- Flowering weeks 1–3: 0.95 g per 4 L
- Flowering weeks 4–7, at peak potassium demand: 1.9 g per 4 L
- Also suits foliar programmes
- Dissolve fully before combining with other nutrients
Technical Specifications
- Guaranteed analysis: 50% water-soluble potash (K2O)
- Source: potassium sulphate
- Format: soluble powder
- NPK: 0-0-50
- Dose rate: 0.5–1.9 g per 4 L
- Suitable for: soil, coco, hydroponics and foliar application
| Stage | Per 1 L | Per 10 L |
|---|---|---|
| Vegetative weeks 1–4 | 0.125 g | 1.25 g |
| Flowering weeks 1–3 | 0.24 g | 2.4 g |
| Flowering weeks 4–7 | 0.475 g | 4.75 g |
Works Well With

FREE Express Delivery on orders over £99. We aim to post same day on Express Delivery — order by 3pm Mon–Fri — and delivery takes 1–2 working days. A few harder-to-stock or large, bulky items can take a little longer — we'll tell you if that applies to your order. Heavy-item surcharges are always shown at checkout before you pay — we only ever charge what delivery costs us. Prefer to collect? Free pickup at our Wembley store.

