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Ships within 48 hours · Estimated delivery Aug 2 - Aug 7
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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
4.1 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 4
GOOD QUALITY
Color: Dark Khaki Melange, Size: Large
GOOD FIT AND VERY GOOD QUALITY I WILL BE BYING MORE.
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Reviewed in the United States on May 3, 2026
★★★★★ 5
Great color and material
Color: Light Blue Melange, Size: Large
Maelreg is becoming my goto for clothing. They use really good quality material and a great look and price. Maelreg continues to impress me, I've now purchased 6-8 of their shirts/hoodies and 2 pair of joggers. I really like them all.
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Reviewed in the United States on February 20, 2026
★★★★★ 5
Hubby’s Fave!
Color: Wistful Mauve Melange, Size: XX-Large, Color: Wistful Mauve Melange, Size: XX-Large
My husband lives in these comfortable performance quarter zips by Maelreg! He says they’re warm in the cool months, they fit great, can be worn with just about any slacks, joggers, or shorts. They come in many different colors and they fit the tall guys like my husband, whose 6’4” He orders 2XL.
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Reviewed in the United States on April 30, 2026
★★★★★ 5
Love them!
Color: Lavender Melange, Size: X-Large
True to size I wear a 2XL they fit great material is nice. perfect for the golf course or business casual. I have 4 different colors and always get compliments! Will definitely get more.
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Reviewed in the United States on May 10, 2026
★★★★★ 3
It's different. Not bad, but nothing special.
Color: Navy Melange, Size: XX-Large
The fit is good. I'd say medium weight. It's not quite as light as some of the microfiber pullovers I like to wear playing golf, and not quite as flexible. I'm not sure I like the decorative stitching. The stitching on the shoulders and along the sides makes it look like it's on inside out. Also, the material has kind of a paper feeling to it (for want of a better description). Overall it's decent looking, not a bad fit, not a bad feel, it just doesn't 'wow' me. Unless the price is better than it is now, and already having one, I doubt I'd buy it again.
Most of this is just my own opinion based on personal preference. The overall manufacturing quality seems very good. Someone else might think this is the nicest pullover they own.
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Reviewed in the United States on June 3, 2025