SKU: 82664873699

Seachem Reef Advantage Calcium

Sale price$133.20 Regular price$148.00
Save 10%

Pay in installments of $37.00 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Sep 5 - Sep 10

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Seachem Reef Advantage CalciumSeachem Reef Advantage Calcium Seachem Reef Advantage Calcium is used to restore and maintain calcium levels in aquariums to support coral growth while also providing magnesium and strontium in proportionate amounts. Concentrated, powder ionic calcium Maintains magnesium and strontium Can be added directly to aquarium Seachem Reef Advantage Calcium is a non caustic (pH 8. 38. 6) optimized blend of ionic calcium designed to restore and maintain calcium

Seachem Reef Advantage Calcium

Seachem Reef Advantage Calcium is used to restore and maintain calcium levels in aquariums to support coral growth while also providing magnesium and strontium in proportionate amounts.

  • Concentrated, powder ionic calcium
  • Maintains magnesium and strontium
  • Can be added directly to aquarium

Seachem 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.

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.

Directions

BEGINNER: Use 5 g (1 level teaspoon) per 150 L (40 gallons) twice a week. Dissolve in at least 250 mL (1 cup*) of freshwater. Check calcium every 2 weeks and adjust amount or frequency accordingly.

ADVANCED: Check calcium level, then follow addition regimen above until calcium is adjusted to 380–420 mg/L. Each 5 g/150 L will raise calcium by about 12 mg/L. Quantity or frequency can be adjusted, but do not exceed 10 g/150L per day. Thereafter, use as required to maintain calcium.

EXPERT: After determining the calcium consumption rate, set up a continuous drip system. Use the following formula to determine how much to add to your top-off water: m=vc/400 (m=grams to add to top off water, v=volume of tank in liters, c=amount to raise calcium in mg/L). For example, if you want to raise calcium by 25 mg/L in a 200 liter tank, then you would add 200x25/400=12.5 g into the top-off water. [For reference: 1 gallon*=3.8 liters, 5 g=1 teaspoon*]. HINTS: If used with Reef Calcium™, it is not necessary to exceed 380 mg/L total calcium. Use Reef Status™: Calcium to measure calcium.

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.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 82664873699

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.1 ★★★★★
Based on 28 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
M
MamaRagu
Carnegie, US
★★★★★ 4
Pretty nice blanket
First off I have to say that this is not exactly a cooling blanket. It is true that when you first get under it, it does feel cool. Shortly thereafter though, wherever the blanket makes contact with you it warms up to your body temperature, so it doesn’t remain cool. Still, I just moved my foot to a different area and hit a cool pocket, so it has its moments. I have to say I really like the weight of this blanket. It’s so hard to find a good blanket, that is not that thick, It is thin, which is exactly what I was looking for since I live in Florida. One side of the blanket is the “cooling“ side which is plain gray, and on the other side is a gray and white striped pattern. I’m not really crazy about the pattern to be honest. I wish this blanket came in more colors or patterns. The blanket fit my queen bed nicely - not too big or too small. For what it is, I’m not really sure I would say it’s good value for the money, but I do like this blanket.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2026
S
sierra
Bozeman, US
★★★★★ 5
Surprisingly, effective cooling blanket
When I first saw this cooling blanket available, I grabbed one right away. I had purchased a cooling blanket for my grandfather last summer that was fantastic but very expensive, so I was curious whether this one would actually compare considering the price difference. Right out of the package, I could immediately feel that it was different from a normal comforter. The fabric itself feels noticeably cool when you touch it, which honestly caught me off guard in a good way. The gray version I have features a striped design on one side and a solid gray color on the reverse. I love that it isn’t just plain white like so many cooling blankets tend to be. The pattern adds some visual interest while still matching pretty much any bedroom setup. The fabric is incredibly soft and smooth against the skin. The brand says it’s made with Ice Toweling technology fabric, which supposedly works by absorbing body heat through the fibers’ molecular structure. I’m not totally sure how that works scientifically, but I can definitely tell you the result is real because the blanket does feel cooler when you sleep under it. Something else I appreciate is that despite being silky smooth, it doesn’t constantly slide off the bed. I was expecting it to behave like a satin sheet, but it actually stays in place surprisingly well and its true to size. Cleaning is straightforward. They recommend air drying the blanket to preserve the cooling fibers, which seems like a reasonable precaution. I would probably treat it like a delicate fabric just to keep it in good shape long term. All things considered, I’m really impressed with this blanket. It’s soft, comfortable, genuinely cooling, and a great value compared to some of the pricey alternatives out there. If you tend to overheat while sleeping, this is definitely worth considering.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 9, 2026
K
Verified Purchase
Kindle Customer
Omaha, US
★★★★★ 5
Superb Product
Color: White, Size: Queen
Wonderful and well made product. It's cool & comfortable and has helped relieve my back pain for a better night's sleep. So glad I bought it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
D
Verified Purchase
Diana Todd
Carnegie, US
★★★★★ 5
Not firm.
Color: White, Size: Queen
This mattress topper is not firm. So it doesn’t really fluff up to 3 inches. More like inches. But when you lay on it ,it’s like so soft and comfortable. It makes you feel so cozy. I plan on ordering a second one for more cushion.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026
L
Verified Purchase
lisa
New York, US
★★★★★ 5
Life changing!!
Color: White, Size: Queen
I slept like I've never slept before in several years! I'm diabetic and run hot and cold all night! The mattress topper is truly a game changer! I have a mattress with 4 inch memory foam. I usually sleep about 2-3 hours and then awake 2-3 hours! Last night I didn't sweat or get hot! I'm not one to waste money when I'm already comfortable! This topper is life changing! It's quality is outstanding! And a value is priceless if you sleep and don't keep waking up! It fits my queen bed perfectly. No odor! I love my topper and never knew it would be a game changer!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2026

recommand products