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Ships within 48 hours · Estimated delivery Jul 20 - Jul 25
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Description
Seachem Laboratories Reef Advantage Calcium SupplementReef Advantage Calcium is a non caustic (pH 8. 3 8. 6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. To prevent this you must provide calcium (Reef Advantage Calcium) and carbonates (Reef Builder or Reef Carbonate). Reef Advantage
Reef Advantage Calcium is a non-caustic (pH 8.3-8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. To prevent this you must provide calcium (Reef Advantage Calcium) and carbonates (Reef Builder or Reef Carbonate). Reef Advantage Calcium also includes magnesium and strontium in amounts proportionate to typical utilization ratios (100:5:0.1, Ca:Mg:Sr). This allows one to maintain these two important elements while maintaining calcium. Unlike limewater (kalkwasser), Reef Advantage Calcium does not have a caustic pH and will not deplete magnesium. Used as directed, it will not deplete alkalinity. DO NOT OVERDOSE: Excess calcium may enhance the loss of carbonate alkalinity. Do not directly mix with any carbonate supplement. Best if calcium & carbonate additives are added on alternate days or at least 30 minutes apart. Guaranteed Analysis: Calcium (Ca) 34.7%; Magnesium (Mg) 1.73%; Strontium (Sr) 0.0346%Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Great morning run gloves
Color: (001) Black / Black / Reflective, Size: Large
Absolutely love these gloves and they are perfect for a fall morning run or as an extra layer inside a mitten I have noticed under armour gloves seem to run slightly small but the large fit ne perfect and id consider my hand a little on the smaller side these fit perfectly snug
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Reviewed in the United States on December 3, 2025
★★★★★ 5
work gloves
Color: (001) Black / Black / Reflective, Size: Large
great gloves... love em
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Reviewed in the United States on May 23, 2025
★★★★★ 3
Lightweight, good touchscreen functionality, poor sewing quality
Color: Black (002)/Black, Size: Small, Color: Black (002)/Black, Size: Small
I really liked these gloves. They are thin, but provided a fair amount of warmth. The touch screen worked great. I also thought the little pocket was a great addition. The downside is the second time I wore them, the seam on the thumb split. Not sure if it was a defect in just this pair or a recurring thing as my size was sold out when I attempted to exchange them.
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Reviewed in the United States on November 22, 2021
★★★★★ 5
Quality Gloves
Color: Black (001)/Jet Gray, Size: Large
May run a little small, but a quality product
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Reviewed in the United States on January 1, 2026
★★★★★ 5
Nice gloves
Color: Black (001)/Jet Gray, Size: Medium
These are my second pair I lost one from my first pair and was happy I could still buy these they are so comfortable and warm for cold weather but not super cold
Fit was perfect
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Reviewed in the United States on January 13, 2026
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