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RAW Potassium – Water-Soluble Straight Element Corrective

RAW Potassium – Water-Soluble Straight Element Corrective

Regular price £9.88
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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
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  • Free Wembley store pickup
  • Advice from the team: 020 3488 0419
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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
Feed Chart
RAW Potassium · soil, coco and hydro · in the feed solution
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
Note — RAW's own 2026 individual-products chart, given per 4 L (1 US gallon): 0.5–1.9 g, for a custom RAW programme. Weigh out for the whole reservoir. Set EC first, then adjust pH, once every base nutrient and additive is in the tank.

Works Well With

Full feed chartNPK RAW

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.