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Gray Coast Calcite is an all natural calcite substrate for all types of marine, reef and tropical aquaria. Its chemical composition will assist in stabilizing calcium and alkalinity while preventing large pH declines. Simply rinse before use to remove any residual dust. Unlike competing wet gravels, Gray Coast is sold dry: this bag contains 35% more gravel than a bag of wet gravel of equal weight. These wet gravels are marketed to give one the impression that they contain living, microscopic animals when in fact they only contain common bacteria. Dry or wet, there are bacteria on every substrate. If one is concerned with shortening the aquarium cycle time for a new system, then the use of a product designed for that particular purpose would be more appropriate (such as Seachem's Stability ¨).
- Natural calcite for all types of marine, reef, and tropical aquaria
- Assists in stabilizing calcium and alkalinity
- Helps prevent large pH declines
- High in magnesium
- Maximizes color of marine fish
Gray Coast™ Mineral Composition
Units=ppm, source: Plasma Emission Spectrometer, EPA Method 3050, Univ. of Georgia Chemical Analysis Lab
| Ca | Fe | Mg | Mn | Mo | Sr | V | Zn |
|---|---|---|---|---|---|---|---|
| 197,500 | 2,876 | 115,400 | 43 | 6 | 63 | 7 | 23 |
Available Size: 3.5 kg
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Petland ships within Canada, Monday through Friday (excluding statutory holidays). Orders made online after Friday at 11 am CDT will ship the following business day (subject to daily order volume and warehouse availability). When considering delivery times, please allow 1-2 business days to process your order after the order is placed. Courier delivery times do not include the day the order is picked up from our warehouse.
Petland will happily ship to your home and/or office. Normally, we use Canada Post, Purolator & Canpar for delivery. "Free Shipping" will usually be sent through Canpar Ground service or Purolator ground service. Canpar Ground & Purolator Ground services do not have guaranteed delivery times and the shipping times will only be estimates.
Changes to our shipping policy due to the Canada Post labour negotiations
Canada Post update as of November 21, 2025:
The parties (Canada Post and the Canadian Union of Postal Workers – CUPW) have reached agreements in principle but have yet to finalize tentative collective agreements for signing. While we do so, we have agreed that all strike/lockout activity is suspended. As the parties work to finalize the tentative agreements, we will make no comment on the details of any potential agreement.
If you are shipping the order to your business or workplace, please include the business name in the shipping address. Unfortunately, Canpar will not deliver to rural locations. For a complete list of these postal codes, click HERE
Orders may be subject to cancellation or require additional confirmations for the following instances due to the risk of fraud:
- The Billing and Shipping addresses are different, and the shipping address is not a Business.
- Orders with international billing addresses
Orders that include "special order" items will not be shipped until the "special order" item arrives in our warehouse.
Please provide a street address if you choose "Free Shipping", Canpar or Purolator as your shipping method.
- If you have a PO Box, Rural Range Road, Township Road or Site land location address, you must choose Canada Post as your shipping method.
- If your address is an apartment or condo, please include the buzzer number.
- If you are shipping to your business or work, please indicate the company name.
Initial orders will require a signature upon delivery. If you are placing your first order and want the shipment left at your front door with "no signature required", you can enter the request in "Special instructions for seller" on your cart page. If you have already processed your order, you can email the request before noon of that business day through our "Contact Us" page. If you place your order on the weekend, you must email the request by noon on Monday. If you have made the request, your subsequent orders will include the request for "no signature required".
If you do not make the request and are not home to sign for the package, Canada Post, Canpar & Purolator will take the shipment to one of their locations where you can pick up your package.
*Please note that neither Petland nor the delivery service is liable for any lost or stolen packages if you have requested the shipment to be left at your front door.
Risk of Loss and Shipping and Delivery:
All items purchased from Petland.ca are made pursuant to a shipment contract with a shipping carrier. This means that the risk of loss and title for such items pass to you upon delivery of the Products to the carrier. Products will be shipped to the address designated by you, if applicable, so long as such address is complete and complies with any shipping restrictions contained on the site. The time and location of delivery of the products to you is at the discretion of the carrier.
Undeliverable packages:
Occasionally, we will have a package returned to us because it was undeliverable. When this occurs, we will issue a full refund for the price of the product plus taxes. Shipping charges are non-refundable. If your order had "Free Shipping" the shipping charges incurred by Petland for your order will be deducted from the total product refund amount.
We can receive packages as undeliverable for the following reasons:
- Missing house number, unit number or buzzer number
- Missing street name, City, or province
- Incorrect Postal Code
- Failed delivery attempts or the item was not picked up from the local depot within 5-10 business days.
- Refused by the recipient.
Petland.ca customers have toll-free access to highly trained customer service reps for solutions to a variety of pet questions. Contact us with any questions or concerns.
SIZE CHART
| Italian | Spanish | German | UK | US | Japanese | Chinese | Russian | Korean |
|---|---|---|---|---|---|---|---|---|
| 34 | 30 | 28 | 4 | 00 | 3 | 155/75A | 36 | 44 |
| 36 | 32 | 30 | 6 | 0 | 5 | 155/80A | 38 | 44 |
| 38 | 34 | 32 | 8 | 2 | 7 | 160/84A | 40 | 55 |
| 40 | 36 | 34 | 10 | 4 | 9 | 165/88A | 42 | 55 |
| 42 | 38 | 36 | 12 | 6 | 11 | 170/92A | 44 | 66 |
| 44 | 40 | 38 | 14 | 8 | 13 | 175/96A | 46 | 66 |
| 46 | 42 | 40 | 16 | 10 | 15 | 170/98A | 48 | 77 |
| 48 | 44 | 42 | 18 | 12 | 17 | 170/100B | 50 | 77 |
| 50 | 46 | 44 | 20 | 14 | 19 | 175/100B | 52 | 88 |
| 52 | 48 | 46 | 22 | 16 | 21 | 180/104B | 54 | 88 |
Notified by Email When This Product Becomes Available.
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