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  • OSA★28 Plant Available Silicon (Original) - High Powered Silicon Fertilizer

OSA★28 - 32oz (1 liter) - Silicic Acid

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Product Description

OSA★28 Plant Available Silicon (as monosilicic acid) strengthens cell walls, increases nutrient uptake, and helps plants handle all kinds of stresses. Other silicates are not bioavailable and take time+microbes to become plant available. This makes OSA★28 the fastest option for delivering silicon directly into the plant cell walls! Silicon also has a synergy with calcium in building better plant structure. Many growers see increased calcium response when feeding with OSA★28.

Silicon is the second most abundant element in the earth's crust. It is now known to be essential for optimal plant growth, health and production. Silicon in the soil isn't available (as various silicates). Plants can only absorb silicon as monosilicic acid (individual molecules). Orthosilicic acid is the stabilized form that transforms into monosilicic acid when mixed in clean water. Silicon chemistry is quite tricky so purity of ingredients and manufacturing excellence are necessary to get a stable and effective product to you.

OSA★28 is manufactured in-house by our staff Ph.D chemists in the USA with domestically sourced ingredients. This means lower cost, fresher product, and more quality control. Monosilicic acid is tricky to make since it requires complex reactions to produce a stable product. OSA★28 is shelf-stable and has higher concentrations than competitive products but at a much lower cost.

Usage rates
Root drench: Mix 0.5ml per gallon of water every feeding from early vegetative through mid-bloom
Foliar spray: Mix 4-8ml per gallon of water 1-2 times per week

Shelf Life
2 years when stored properly -- Seal after use and store in a cool dark place

This bottle mixes 120 gallons of feed water!

Other Details

Gallons Mixed:
Shelf Life:
2 years

Product Reviews

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  1. Plants love it! 5 Star Review

    Posted by on Aug 18th 2017

    It has been great for my plants.

  2. the ultimate hydro product on the market. 5 Star Review

    Posted by on May 3rd 2017

    Totally love Osa28 for hydroponics. 20 mins after adding it to the rez plants perk up and reach for the sky! Never healthier!

  3. Just try it 5 Star Review

    Posted by on Nov 3rd 2016

    Osa 28 is one of the most efffective nutrients/supplements I have ever given my plants. The growth rates and improvement in structure are second to none. The price point is also superior to any other like product on the market.

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