SKU: 10362896880

Seachem Kalkwasser

Sale price$184.50 Regular price$205.00
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Description

Seachem KalkwasserSeachem Reef Kalkwasser Seachem Kalkwasser is used to prepare limewater solutions that maintain calcium concentrations at natural seawater levels and increase pH without impacting carbonate alkalinity. Very pure calcium hydroxide Ideal for increasing calcium in top off water Increases pH with no impact on carbonate alkalinity Seachem Reef Kalkwasser is a pure calcium hydroxide with unsurpassed purity and solubility characteristics. Calcium hydroxide

Seachem Reef Kalkwasser

Seachem Kalkwasser is used to prepare limewater solutions that maintain calcium concentrations at natural seawater levels and increase pH without impacting carbonate alkalinity.

  • Very pure calcium hydroxide
  • Ideal for increasing calcium in top-off water
  • Increases pH with no impact on carbonate alkalinity

Seachem Reef Kalkwasser is a pure calcium hydroxide with unsurpassed purity and solubility characteristics. Calcium hydroxide is used to prepare limewater (kalkwasser) solutions that will maintain calcium concentrations at natural seawater levels. Kalkwasser solutions maintain calcium directly and carbonate alkalinity indirectly. However, its capacity to perform these functions is dependent on evaporation rate and CO2 concentration. If these two factors are insufficient you can provide additional calcium with Reef Advantage Calcium™, Reef Complete®, or Reef Calcium™, and carbonate alkalinity with Reef Builder™ or Reef Carbonate™ (do not mix these directly with a kalkwasser solution).

Many who use kalkwasser are quite successful with their marine systems and find it to be an effective way of maintaining calcium. However, it can be a difficult technique for the beginner to master. The carbonate alkalinity must be monitored and adjusted to ensure that it does not become depleted through chalk (calcium carbonate) precipitation. The magnesium concentration must also be monitored and maintained since precipitation of magnesium hydroxide (arising from excess hydroxyl ions) can lead to a change in the balance of the various buffer systems present which can result in drastic pH shifts. Additionally, magnesium is an essential component of seawater that is required by all corals. There will be an increase in the build up of chalk on substrate and plumbing surfaces which will require more frequent cleanings in order to maintain the proper functioning of the aquarium. If due care and diligence is paid to all of these factors, there is no reason one cannot maintain a successful reef system while using kalkwasser. While Reef Kalkwasser™ is a high purity and economical limewater mix, the beginner, or someone with not as much time to devote to their system, may prefer to use other less involved methods for maintaining proper ionic concentration levels.

Directions

Never add this product directly to the tank. Add 3 g (1 teaspoon) to 4 L (1 gallon*) of water and mix to dissolve. If using pure water, a fully saturated solution is prepared by adding 6 g (2 teaspoons) to 4 L (1 gallon*). Drip this solution into tank. Monitor pH and carbonate alkalinity. Adjust rate of addition to maintain a stable pH (8.3–8.4). HINTS: Adding 4 L (1 gallon*) of a saturated kalkwasser solution to 150 L (40 gallons*) will raise calcium by 24 mg/L. Always use the clear supernatant (top solution) only and do not allow undissolved material to enter the aquarium. Keep this container tightly closed when not in use and minimize solution/air contact to avoid calcium carbonate formation/precipitation.

Avoid contact or breathing dust. Do not eat or get in eyes. In case of contact, flush area with water for 5–10 minutes. In case of eye contact, wash eyes with water immediately (5–10 minutes) and seek medical attention.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
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SKU: 10362896880

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Sylvia Barr
Waukegan, US
★★★★★ 5
Great quality
Color: Assorted
I use these bands every day. They have different resistant levels. I’m not sure of the pounds but easier to more difficult in range. You can actually exercise with these bands while you’re watching TV, so I do some of my exercises in the evenings while watching TV, I can see a big difference in the strength of my arms and legs. You just have to keep with it.
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Reviewed in the United States on May 24, 2026
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Stephanie Miller
Omaha, US
★★★★★ 5
Good workout
Color: Berry
I had spinal surgery. These have saved me so much money in therapy. They are durable and the strengths are great as you build muscle.
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Reviewed in the United States on May 18, 2026
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Verified Purchase
AMZ Customer
Draper, US
★★★★★ 5
Perfect!
Color: Coffee
Second pair (first one was a gift) and it’s perfect for what it is needed for! Love the colors and the little bag helps keep it clean and dust free. Love the colors! Delivery & process were great too.
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Reviewed in the United States on May 15, 2026
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Verified Purchase
Hillsong Melody
Omaha, US
★★★★★ 3
Rolls up easily
Color: Pastel, Color: Pastel
I purchased these bands after seeing all the positive reviews on Amazon. I like the color options and the variety of resistance bands, however the quality is not that great. Bands are thin and they roll up easily. I’ve used them both on bare skin (which I googled was not recommended because it irritates skin) and on top of leggings and both times the bands roll up. The bag it comes with is also very small and I basically have to roll up the bands to squeeze all of them in there. If you are a beginner at using bands, I think this product is alright. For more advanced workouts, would recommend better quality resistance bands.
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Reviewed in the United States on May 17, 2026
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Verified Purchase
Sailboat Steve
West Palm Beach, US
★★★★★ 5
A complete gym in your pocket.
Color: Assorted
Simple but effective. I'm able to pack these into almost anywhere and use them as a mini gym wherever I go. With a little creativity, they can be used to add resistance to almost any exercise. I use them for stretches, face pulls, bicep curls, and even with squats. 5 different resistance levels means you can mix and match to find the perfect resistance for whatever you're doing. I've had mine a couple of months now and have noticed no difference in elasticity or resistance, and I use them almost every day. Would definitely recommend as a portable resistance device and would definitely buy again.
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Reviewed in the United States on May 20, 2026

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