Description
Stronger Stems and Cell Walls With pH-Neutral Silica
RAW Silica from NPK Industries is a soluble powder of 45% silicon dioxide, derived from diatomite — one of the highest concentrations available to home growers. Unlike the potassium silicates in most liquid silica products, it is a biogenic silica: pH neutral, it does not cloud the tank, and it can be used at every stage of growth and flowering in soil, coco and hydro.
Key Benefits
- 45% silicon dioxide – no fillers, stabilisers or added water.
- Reinforces cell walls – silicon builds into stems and leaves for sturdier growth that holds heavy flowers and fruit.
- No pH swing – will not push the solution alkaline or cloud it, unlike potassium silicate.
- Better water uptake – raises root permeability, improving drought and heat tolerance.
- Microbe-friendly – a biogenic silica gentle enough to sit alongside beneficial microbes in living soil.
- Fast and slow release – some particles dissolve straight away, others stay in the root zone for gradual release.
Weak Stems and Stress-Damaged Leaves
Silicon is a beneficial element rather than an essential one, but plants that take it up build thicker, stronger cell walls, much as rebar reinforces concrete. That shows as sturdier stems, leaves that resist powdery mildew and sap-sucking pests better, and plants that cope better with heat and drought — commercial cucumber growers add silicon to their water for exactly this reason. RAW Silica supplies it without the high pH and clouding that liquid silicates bring to a hydroponic tank.
How to Use
- Label rate: 1/8 to 1/4 level teaspoon per US gallon (3.8 L) in the reservoir or watering can.
- Growth week 1: 0.16 ml of powder per litre; growth weeks 2–4: 0.33 ml per litre.
- Flowering weeks 1–7: 0.33 ml per litre.
- Mixing: add it to the diluted feed, not to concentrated nutrient, and keep the tank agitated — it is a flowable powder that suspends rather than fully dissolving.
- Media: soil, coco, hydroponic and foliar programmes.
Technical Specifications
- Type: water-compatible silicon supplement (powder)
- Contents: 45% silicon dioxide (SiO2), derived from diatomite — a non-plant-food ingredient
- pH effect: neutral; does not cloud the solution
- Dose: 1/8–1/4 level tsp per US gallon (about 0.16–0.33 ml of powder per litre)
- Stage: all of growth and flowering
- Media: soil, coco, hydro; foliar programmes
- Maker: NPK Industries (RAW Soluble), USA
Frequently Asked Questions
Will RAW Silica raise my pH like liquid silica?
No. Most silica additives are potassium silicate, which is strongly alkaline; RAW Silica is silicon dioxide from diatomite and is pH neutral, so it neither lifts the pH nor clouds the solution.
Why doesn't it dissolve completely?
It is a flowable powder: part dissolves straight away for quick uptake and the rest stays suspended in the root zone for gradual release. Keep the reservoir moving with an air stone or pump.
Can I use it with beneficial microbes?
Yes. NPK Industries describe it as microbe-friendly — biogenic silica is even used as a carrier for microbial inoculants — so it suits living soil and RAW's own microbe products.
Works Well With
RAW Humic AcidRuns alongside Silica on RAW's own feed chart
RAW KelpRuns alongside Silica on RAW's own feed chart
