Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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For Your Every Summer RSVP, with Code: SUMMER15
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
4.0 ★★★★★
Based on 872 reviews
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Product Reviews
★★★★★ 5
Pretty pillow cover
Nice soft pillow cover and pretty color. Would purchase this brand again.
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Reviewed in the United States on August 2, 2025
★★★★★ 4
Excellent quality; fit may be tight
The quality of these covers is very good. The feel is soft and warm. The color is rich. They wash easily and well. My only problem is the fit. My 15” throw pillows are overstuffed, and they won’t fit in these covers. If your pillows are not overstuffed, I highly recommend these.
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Reviewed in the United States on December 1, 2025
★★★★★ 5
Really like these for the price
I was surprised when I received these because they are made better than expected. The color is accurate and they are nice and fluffy. Hidden zipper works well too. We will see how they wash when the time comes, but I usually bag items like this so should be fine.
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Reviewed in the United States on February 12, 2025
★★★★★ 5
Luxurious feel
Color: Light Brown, Size: Throw (50" X 60")
This blanket is soft and fuzzy. It has a little weight to it so it’s great to snuggle up on the couch with. Double lined makes it feeling luxurious. Haven’t noticed any shedding yet I’ve had it for a month and have washed it a couple times.
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Reviewed in the United States on May 7, 2026
★★★★★ 5
Absolutely Excellent
Color: Pink, Size: Throw (50" X 60")
This blanket is a Comfrt Dupe!! Ultra soft. My new favorite!!
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Reviewed in the United States on May 28, 2026