SKU: 82664873699

Seachem Reef Advantage Calcium

Sale price$133.20 Regular price$148.00
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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
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 82664873699

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StephTradesC8
Cuba, US
★★★★★ 5
Works Well and Good Quality
Color: Black-Stock Market-31.5"x15.8"(with Wall Charger)
The recharging feature works well for both phone and earbuds. Phone charges very fast. Great looking mousepad that has ample size for both keyboard and mouse. Mouse moves easily on the surface and is much better than using it solely on a tabletop. Great price too!
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Reviewed in the United States on April 12, 2026
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Chicken Little
San Leandro, US
★★★★★ 5
A pad that just delivers
Color: Black-31.5"x15.8"
The item came in minimalist packaging. The mat came out and was ready to use immediately. The build quality is great with no distortions in shape that I had with a lower quality gaming mouse pad I was gifted once. The wireless charging just worked, and true to word, if I place my phone just right on the spot it engaged turbo wireless charging. It felt great, smooth like a high quality mouse pad, just huge. I can fit my laptop, keyboard and mouse with room to spare. Don't regret decision to buy.
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Reviewed in the United States on May 3, 2026
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Tom La Femina
Houston, US
★★★★★ 4
Check to see if you need an adapter
Color: Black-Phone Holder-31.5"x15.8"
Very nice pad, good size and neat looking. Charges the phone and do not need a separate charger. ONE WORD OF CAUTION. I expected to be able to hook it up and use as delivered. BUT, expecting a USB compatible wire that fits into a normal plug, I needed an adapter to be able to plug it into a plug adapter. The ad needs to be able to highlight the fact that you may need an adapter.
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Reviewed in the United States on February 15, 2026
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Jonathan Heacox
Alexandria, US
★★★★★ 5
Works great; As Advertised.
Color: Black-Phone Holder-31.5"x15.8"
Love this pad with wireless charging. Doesn't come with a charging brick but does come with everything else you need.
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Reviewed in the United States on May 24, 2026
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Cute Crissy
Cuba, US
★★★★★ 5
Mouse Pad Charger
Color: Black-27.5"x11.8"
I absolutely love the mouse pad. It fits my 17.3 inch laptop nicely and my mouse. It's great for charging my phone next to me while I work. Unfortunately, it does not work for the Air Pods. It must be for an older version. Nonetheless, it's still a great buy.
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Reviewed in the United States on May 22, 2026

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