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Reviewed by Jason B.
Verified Buyer
I recommend this product
Gypsum
Love it for my garden very good addition to the arsenal
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Diamond K | SKU:
OG101
Bulk Diamond K Gypsum - Solution Grade
Rated 5.0 out of 5
Regular price
$15.00
Unit price
Bulk Diamond K Gypsum - Solution Grade - 50 lb is backordered and will ship as soon as it is back in stock.
Quality First
Quality First
BuildASoil is committed to sourcing the highest quality ingredients you can trust. over 10,000 Five Star Reviews and over a decade in business
Delivery and Shipping
Delivery and Shipping
Shipping Policy
Shipping is expensive, and it gets more expensive almost every year. We are not going to pretend otherwise. What we can tell you is that we work hard to find the most reliable and affordable way to get your order to you, and we pass along free shipping wherever it makes sense.
Free shipping on any order with two or more items. The one exception is bulk items, meaning the large or heavy products that have to move by freight or oversized parcel. If your cart qualifies, free shipping is applied automatically at checkout.
Why two items and not a dollar amount?
Most stores set free shipping at a dollar threshold. That works when you sell light things like clothing. We don't. We ship soil, amendments, and heavy real goods that are expensive and awkward to move, so a dollar minimum doesn't reflect what shipping actually costs us.
We are a small business with no outside financial backing, and we are not Amazon. We manufacture, pack, and ship everything in house so we can control quality, which means real people picking, boxing, taping, and labeling every order, and that means real jobs. When we ship a single item for free, the only way to cover it is to raise prices across the board, and we would rather not do that. Asking for two or more items on free orders lets us keep prices lower for everyone and keep shipping sustainable. We hate high shipping costs as much as you do, and this is the fairest way we have found to keep them down.
Delivery estimates
Every product page shows an estimated delivery window based on current fulfillment and carrier schedules, so you know what to expect before you buy.
Shipping Options
BuildASoil Shipping
Free
Free on eligible orders with two or more items. We select the carrier and method.
Standard Shipping
Paid
Standard ground service.
Standard Shipping: Rushed Out the Door
Paid, slightly more
Same standard transit, but we push it out the door the same day when we can.
Get It Fast
Higher
Prioritized fulfillment with faster transit.
Overnight It
Highest
The fastest option we offer.
Pickup at Factory Store
Free
Bring your order confirmation and a valid ID.
FedEx Freight (Economy)
Quoted
For large or heavy orders.
FedEx Freight (Priority)
Quoted
For large or heavy orders, faster transit.
Carriers
We ship with FedEx, UPS, and USPS, and we pick the carrier that gets your order to you reliably at the best cost. We cannot guarantee a specific carrier unless you arrange it with us ahead of time.
PO Boxes
Orders to PO Boxes often cost more and usually do not qualify for free shipping. Use a physical address to avoid delays and added fees.
Outside the Continental US
We ship to Alaska, Hawaii, Puerto Rico, Guam, the Northern Mariana Islands, and the US Virgin Islands. Free shipping generally does not apply to large or bulky items going to these destinations, though Hawaii and Alaska have more flexibility depending on carrier policy. Rates are quoted at checkout or on request.
Canada
We ship select items to Canada. Canadian customers need to choose "UPS Standard Shipping to Canada" at checkout so your order clears customs cleanly and you avoid surprise brokerage fees. Orders placed with other methods can be delayed or rejected at the border.
Vendor-Fulfilled Items
Some products ship directly from our vendor partners and show their own estimated ship dates on the product page. Questions about these go to support@buildasoil.com.
Freight Shipments
Freight orders arrive on pallets by box truck or semi. We assume you need liftgate service unless you tell us otherwise.
Inspect every freight shipment before you sign. Count the packages and check for damage. Signing the delivery receipt confirms the order arrived complete and undamaged, so note any problem on the receipt before you sign it.
Full Truckloads
Full truckload (FTL) orders are custom quoted after checkout based on your location, order volume, and how the truck will be unloaded.
- Let us know if you have a dock, forklift, or other unloading equipment.
- Tell us if you need liftgate or manual unload service.
- Email support@buildasoil.com ahead of time for an FTL quote.
Order Tracking
We email tracking as soon as your order ships. If it does not arrive, check buildasoil.aftership.com with your order details, or email support@buildasoil.com.
Shipping Protection
This optional add-on at checkout covers your shipment against loss, theft, and damage, and we fast-track those claims for replacement or resolution. Even with protection, photos and documentation help us move carrier claims along faster.
Claims
Send all claims to support@buildasoil.com. We do not process claims by phone.
Include:
- A description of the issue
- Photos or video of the damage, or of missing or incorrect items
- Images of the packaging and labels
Hold onto the packaging and any damaged items until the claim is resolved, since carriers may require an inspection.
Claim deadlines
- Damage or missing items: within 60 days of delivery
- Incorrect products: within 60 days of shipment
- Lost or misdelivered packages: within 60 days of shipment
Once Your Order Leaves Our Facility
We help with every carrier claim we can. But once an order is in the carrier's hands, we cannot control delays, damage, or misdelivery, and the carrier makes the final call on claims.
Bulk Diamond K Gypsum - Solution Grade - 50 lb is backordered and will ship as soon as it is back in stock.
Description
Description
Premium 97 Solution Grade Diamond Gypsum
The first step in building potting soil or in building native soil is to get the calcium right!
Gypsum is Calcium Sulfate and is excellent calcium source for no-till growers. The added sulfur helps keep terps high and the soil balanced.
EXTREMELY PURE
97% Calcium sulfate dihydrate, the purest available on the market.
HIGHLY SOLUBLE
97% passing 200 mesh and 92% passing 325 mesh means it goes into solution faster and more completely than other sources.
IMPROVES LOW – SOLUTE WATER
Adds minerals to pure water to improve water penetration into soil.
LOWER APPLICATION RATES
Other western gypsum sources can require up to 4x more product to get the same results.
HELPS RECLAIM SODIC SOILS
Ultra-soluble calcium to replace and leach sodium in the soil.
How to Use
- Use at lower rates (50-400 lb/acre) than non-soluble gypsum, but more frequently
- For foliar rates use 1-10 lb/acre
- Can be used for fertigation
- 1-2 tablespoons per 5 gallons for container gardening/flush
- When irrigating with gypsum, it's best used in small amounts more often rather than forcing a large amount at at time.
Stock Solution & Injector Setup
Gypsum is only slightly soluble. A true “solution” can’t reach the strength you need, so this is a slurry. Keep it agitated and filtered.
Stock mix (works well as a slurry)
8 oz gypsum (by weight) per 1 gallon of water.
8 oz = 226.8 g per gallon of stock.
How much finished water will that treat at 2 g/gal?
226.8 g ÷ 2 g/gal = ~113.4 gallons finished water.
Using an injector
Target dose is 2 grams per gal finished.
Required stock strength by ratio:
1:100 → need 200 g/gal in stock (= ~7.06 oz/gal)
Adding 8 oz/gal stock gives ~2.27 g/gal finished—slightly “hot” but close and totally fine to use as a go to ratio.
If you want it exact you will want to weigh your gypsum in house and extrapolate that way.
1:128 (common Dosatron) → need 256 g/gal (= ~9.03 oz/gal)
For 1:128, use ~9.0 oz/gal stock to land right at 2 g/gal finished.
Because the numbers are close you could just use the 8 Ounces per gallon but the level of precision is up to you.
Practical tips for slurry injection
- Agitate constantly if possible.
- Keep the injector pickup 2–3" above the bottom so it draws well-suspended slurry, not settled silt.
- Strain the slurry into the stock tank (paint strainer bag) and keep the inline 200-mesh filter clean.
- Don’t co-tank with phosphate-heavy or carbonate/alkaline products (can precipitate).
- Flush the system with clear water after dosing
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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Based on 108 ratings
98%
of reviewers would recommend this product to a friend
Customer photos and videos
108 Reviews
Reviewed by Larry B.
Verified Buyer
I recommend this product
Diamond K
I have tried other “fine “ gypsum and but none were really soluble like this.
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Reviewed by Dustin J.
Verified Buyer
I recommend this product
Always the highest quality
Versatile and easy to use, and always is of the highest quality!
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Reviewed by Jonathan Damon M.
Verified Buyer
I recommend this product
🫡
Cheap and extremely useful
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Reviewed by Jarrod
Verified Buyer
I recommend this product
The best
Great high quality products Everytime thanks again
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Rated 5.0 out of 5
