$15.87
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- – 4-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
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Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
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30-day returns
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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Only 5 left in stock, order soon!
Arrives
Wednesday, Nov 11
At a glance
- Condition
- New
- Color
- clear
- Size
- 500 mL
- Dimensions
- 0.15 x 1.5 x 0.15 in; 1.32 lb
- Weight
- 0.6 kg
- Item Form
- Liquid
- Item Type Name
- Seachem Reef Calcium 500ml
- In the box
- Seachem Reef Calcium 500ml
- Warranty
- Warranty
Features 3
- Liquid organic calcium source
- Maintains calcium and accelerates coral growth
- Concentrated (50,000 mg/L)
Specs 19
| Brand | Seachem |
|---|---|
| Liquid Volume | 500 ml |
| Item Weight | 0.6 kg |
| Item Form | Liquid |
| Unit Count | 1 Count |
| Product Dimensions | 0.15 x 1.5 x 0.15 inches; 1.32 pounds |
| Item model number | 116035309 |
| Department | Unisex-Adult |
| Manufacturer | Seachem Laboratories, Inc. |
| Brand Name | Seachem |
| UPC | 000116035309 |
| Number of Items | 1 |
| Global Trade Identification Number | 09 |
| Item Type Name | Seachem Reef Calcium 500ml |
| Model Number | 116035309 |
| Manufacturer Part Number | 353 |
| Pet Type | Fish |
| Target Species | Fish |
| Allergen Information | Yam Free |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Nov 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
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- Zip Pay in 4
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- Financing through Google Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Good purchase
Size: 250 mL
Color: clear
Good product no problems
Reviewed in the United States on September 21, 2025 by Rich
PERFECT for my snail tank water changes!
Size: 250 mL
Color: clear
I was running into issues in my snail tank during water changes. My tap water is very very soft and acidic, obviously not good for snails. I had them in a tub filled with aragonite and wonder shells but the time after a large water change I was noticing shell erosion since the water still took some time to harden up despite all the hardening products in the water. I started adding this calcium on top of my normal GH/KH+ and that seems to have done the trick! New shell growth looks perfectly healthy! I put it in these 2ml pump bottles and now water changes are an absolute breeze. I'd recommend the same if you have a lot of water you change regularly.
...
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Reviewed in the United States on January 15, 2025 by Bart Bart
High quality Calcium supplement
Size: 250 mL
Color: clear
High quality Calcium supplement - no adverse effects from fish nor snails.
Reviewed in the United States on July 24, 2025 by Michael Silverman
Works well. Good product
Size: 250 mL
Color: clear
It's Amazon. Good product good price. Comes to your door
Reviewed in the United States on April 10, 2024 by Jeff G
Great for maintaining high calcium levels for freshwater snails
Size: 500 mL
Color: clear
My water is very hard but for some reason has very little actual bioavailable calcium. My mystery snails have really be struggling and I was looking for an effective way to directly add calcium to the water column quickly. I decided to try this out alongside a calcium water test kit, and used it to get my calcium levels up to 60-70ppm/L which is ideal for mystery snails and other snails. This is formulated to marine aquariums but it can be used in freshwater with some caution and a calcium test kit. A little goes a long way. Really helped my snails!
...
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Reviewed in the United States on February 14, 2024 by jennifer
Snail Health
Size: 500 mL
Color: clear
Good for fresh water if you have snails. Just follow the directions on the bottle
Reviewed in the United States on April 23, 2025 by Reyna Bautista
Coral love this stuff
Size: 500 mL
Color: clear
The best
Reviewed in the United States on April 19, 2025 by Brian
Seachem Reef Calcium 500ml
Size: 500 mL
Color: clear
Reef Calcium is good quality, but very expensive in the scheme of things. I switched to using the Bulk Reef Supply Bulk Calcium Chloride that I mix myself and that is much more affordable and seems to be just as good at raising my calcium.
Reviewed in the United States on December 25, 2014 by Bryan