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BuildASoil  |  SKU: AG101

Agsil16H Potassium Silicate

Rated 4.9 out of 5
Based on 372 ratings
$34.00
Shipping calculated at checkout.
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Delivery and Shipping

 

BuildASoil Shipping Policy

At BuildASoil, we’re committed to providing the most affordable and reliable shipping possible—for both our customers and our business. We continuously evaluate and improve our fulfillment process to ensure faster, smoother deliveries. We know shipping is often a pain point in shopping online, and our goal is to make it feel painless. For full details, please read the complete policy below.

Notice: Each product page displays accurate estimated delivery windows based on real-time fulfillment and carrier schedules.


📦 Shipping Options 
  • BuildASoil Shipping: Our complimentary shipping method for qualifying orders. We choose the most cost-effective carrier and shipping method. Delivery may take up to 10 business days. Most items qualify when you purchase two or more eligible products. Some qualify individually.
  • Standard Shipping:  A paid option where we ship using standard ground services.   
     
  • Standard Shipping: Rushed Out the Door! Includes everything in Standard Shipping, but adds on same day order processing (not guaranteed).
  • Get It Fast: Our expedited service. Orders are shipped with 2-3 day transit times and are prioritized for fulfillment, with most leaving the same business day (not guaranteed).
  • Overnight It: Ships via overnight service with immediate fulfillment for urgent deliveries.
  • FedEx Freight (Economy or Priority): For large or heavy orders. All freight ships via FedEx Freight unless arranged otherwise. Contact us in advance if no liftgate is required.
  • Pickup at Factory Store – Available Within 24 Hours! Select this option to pick up your order at our factory store. We'll notify you when it's ready. Bring your order confirmation and a valid ID.
Option Cost Transit Speed Fulfillment Speed Notes
BuildASoil Shipping Free Up to 10 business days Standard Free on any eligible items; ships at our discretion
Standard Shipping Paid 3-7 business Days Standard Standard handling and transit
Standard Shipping: Rushed Out the Door! Paid (slightly more) 3-7 business Days Same Day Fast handling out the door with standard transit
Get It Fast Higher 2–3 business days Same Day Fast handling and transit
Overnight It Highest 1 business day ASAP Fastest possible option
Pickup at Factory Store Free N/A Ready In 24hrs Local pickup option
FedEx Freight Economy Varies by order 2–9 business days (varies) Varies For large or heavy orders
FedEx Freight Priority Varies by order 2–7 business days (faster) Varies For large or heavy orders

🚚 Carriers Used

We ship with FedEx, UPS, and USPS. Carrier preference is not guaranteed unless explicitly communicated to us. 


📮 PO Boxes 

Orders shipped to PO Boxes often require additional costs and are not eligible for free shipping. Use a physical address to avoid delays and fees.


🏝️ Outside Continental US

We ship to Alaska, Hawaii, Puerto Rico, Guam, Northern Mariana Islands and the U.S. Virgin Islands. Free shipping generally does not apply to large or bulky items shipped to these locations. Hawaii and Alaska do have more flexibility with this due to carrier policies. Quotes will be calculated at checkout or by request.


🇨🇦 Canada Orders

We do ship to Canada for select items. Canadian customers must choose “UPS Standard® Shipping to Canada with no Surprises!” at checkout to ensure proper customs clearance and avoid unexpected brokerage fees or delays. Orders using other methods may be subject to delays or rejection at customs.


🏭 Vendor-Fulfilled Items

Some products are fulfilled by vendor partners and display estimated ship dates on their product pages. Questions about these items should be sent to support@buildasoil.com.


🚛 Freight Shipments

Freight deliveries involve pallets via box trucks or semis. Liftgate service is assumed unless specified otherwise.

Important: Inspect all freight shipments before signing. Count and examine all packages. Signing the delivery receipt confirms that the order arrived in full and undamaged.


🚛 Full Truckloads

Orders that qualify for full truckload (FTL) delivery will be custom quoted after checkout. Rates are based on location, order volume, and unloading requirements.

  • Indicate if you have a dock, forklift, or unloading equipment.
  • If you need liftgate or manual unload service, please notify us.
  • Contact support@buildasoil.com in advance for FTL quotes.

🔍 Order Tracking

Tracking information is emailed upon shipment. If not received, visit buildasoil.aftership.com and enter your order details. For help, contact support@buildasoil.com.


🛡️ Shipping Protection

This low-cost optional add-on at checkout insures your shipment against loss, theft, and damage. Claims are fast-tracked for resolution or replacement.

Even with protection, we encourage submitting photos, videos, and documentation to assist our carrier claims process.


📋 Claims Policy

All claims must be submitted via support@buildasoil.com. Phone-based claims are not accepted.

Required Documentation:

  • Issue description
  • Photos/videos of damage, missing or incorrect items
  • Images of packaging and labels

Do not discard packaging or damaged items—carriers may require inspection.

Claim Deadlines

  • Damage / Missing Items: Within 5 business days of delivery
  • Incorrect Products: Within 30 days of delivery
  • Lost or Misdelivered Packages: Within 30 days of shipment

⚠️ Responsibility Disclaimer

Once an order leaves our facility, we are not liable for delays, damage, or misdelivery caused by the carrier. We assist with claims but final decisions rest with the carrier.

We have zero tolerance for mistreatment of delivery drivers. Verified misconduct may result in cancellation and refund of your order minus shipping costs.

Description

Description

FREE SHIPPING ON SELECT AGSIL16H! (see above)

AGSIL16H is manufactured by PQ corporation and is one of the few silica products on the market that is water soluble. This simple powder will save money over buying water based Silica Bottle products. This is approved for organic use as a foliar spray and is an excellent oil emulsifier.

See the MSDS report here: AGSIL16H MSDS PDF

Compare to Pro-Tekt, Rhino Skin, Silica Blast and all other Silica Bottled products. There is no secret ingredient, all are made from potassium silicate.

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Useful Info

Research on the subject: (Much more info if you follow the link)

http://www.nutri-tech.com.au/blog/2010/06/silica-the-hidden-cost-of-chemicals/

Silica - The Hidden Cost of Chemicals
A major mineral is missing in many soils and most soil tests do not even monitor its presence. This mineral can increase stress resistance, boost photosynthesis and chlorophyll content, improve drought resistance, salt tolerance and soil fertility and prevent lodging. lt can also reduce insect pressure, frost damage and destructive disease while lowering irrigation rates, neutralizing heavy metal toxicity and countering the negative effects of excess sodium. If I were to tell you that this same missing mineral can increase root growth, boost yield and enhance crop quality, you could well ask, “how could we have overlooked something so important?” and you would be correct. It has been a serious oversight. The mineral in question is silicon, and science is rapidly revealing the scope and scale of our silicon neglect.
Poverty in a Sea of Abundance
Silicon is not classed as an essential nutrient, but, in response to a wealth of new findings highlighting the importance of this nutrient, that status may soon change. Silicon is the second most abundant mineral on the planet. It is everywhere. Clays are alumina silicates and sand is largely silicon, so how could there be a shortage of silicon? The answer lies in the form of silicon that enters the plant. Plants uptake silicon as silicicacid and this is what is missing in the soil. Something we have done in conventional agriculture appears to have compromised the conversion of insoluble silicon into the plant available form. It may reflect a mineral imbalance or we may have knocked out some of the soil microbe species that solubilise this mineral. It is not yet understood what drove the widespread deficiency but we do know that a healthy, disease suppressive soil should contain 100 ppm of monosilicic acid (as measured in a soil analysis) and very few soils come anywhere near that mark!

Little was known about the multiple roles of silicon until recently. It was known to be present in every soil but it was only when it became less plant available that it was realized that there may be a link between this loss and a host of growing problems. During the last decade, silicon seems to have become “flavor of the month” in the soil science community. Researchers have delved more deeply and hundreds of papers have been presented at the International Silicon Conferences in Brazil and South Africa. This neglected mineral is now emerging as a key player in proactive pest and disease management and the production of nutrient dense food. If you are not yet aware of the silicon story then this article should serve to fill some gaps.
In Conclusion
Proactivity is the essence of the biological approach. If you understand how plants protect themselves, then you provide the necessary components to maximise that process and minimize the need for chemical intervention. In this context, silicon is an essential pre-requisite for proactive pest and stress management and should be an integral part of every good nutrition program.

Source: https://www.thcfarmer.com/community/threads/plant-available-silicon-soluble-silicon-in-fertilizer-sources-aafpco-approved-method.76318/

How To Use

Dry Recipe

Use 1.5 Grams (Just under 1/2 teaspoon) Per Gallon of Water for Foliar Spray or Soil Drench.

How to use this powder dry with your Neem Oil: Mix 1.5 grams (Just under 1/2 Teaspoon) AgSil 16H with 1/2 Ounce Ahimsa Pure Neem Oil to emulsify the oil. Then mix this emulsified oil with one gallon final volume spray solution. Spray every other week covering all plant surfaces (top and bottom of leaves) until it runs off.

Liquid Recipe

Make your own nutrient bottle! Here is a recipe to make a liquid version of a Silica Nutrient.

Just follow the mixing recipe below.

 

If you don't have a scale: Use 3 Tablespoons of Agsil16H for every 8 ounces water.

Following the above recipe to make 1 Liter of Liquid Solution you would mix 148 Grams of Agsil16H into 1 Liter of water. Then you can store it in a bottle or jar and shake well before using. (1 Liter of water is about 34 Ounces)

Here is a photo what 148 Grams of Agsil16H looks like. I weighed this out and then put into this container so you can hopefully do this without a scale at your house.

Use the Liquid Solution you just made at 1/4 to 1/2 teaspoon per gallon. Yes, it's safe to use on every single watering, but we don't do that because we don't feel it's required with ANY ingredient. Some people use Aloe and Silica with every watering and we have seen stunning results.

Use 1/2 teaspoon of the solution per gallon to foliar spray.

(I've used 2-3 Teaspoons per gallon without ill effects, but encourage you to start slow and see what you think)


Questions?

We are here to help and our entire staff knows how to grow. Just reach out via chat, email or even phone. We are passionate about growing and want you to succeed.

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average rating 4.9 out of 5
Based on 372 ratings
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97% of reviewers would recommend this product to a friend
Customer photos and videos
372 Reviews
Reviewed by Eugene T.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

I bought this 3 months ago, it's not my recent purchase, as your email says.

Makes the plant feel tougher, stronger, stems are stronger, leaves feel like sandpaper when you run your finger across the top of them, seems to make her happy.

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Reviewed by guy m.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Works great.

Works great.

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Reviewed by Donald P.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Agsil 16

High quality silicate at a great price. Same quality BAS packaging. A great addition to the garden

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Reviewed by Steve Y.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Turns stems green picks up weak steams

Definitely does what it says can see difference in plants that had been started without product plants started with early treatment have noticeably bigger stronger stems they stand up one good thing plants that weren’t treated from beginning have noticeably improvement after 2 weeks

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Reviewed by Alex B.
I recommend this product
Rated 5 out of 5
Review posted

Easy way to add silica and strengthen your plants!

I love this product. It makes adding silica easy and is a great way to strengthen cell walls and your plants overall health and vigour. It can be used as a foliar or a root drench. I have been using Agsil along with BAS soil and products with much success! Thank you BUILDASOIL!

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