--- product_id: 20790332 title: "Brightwell Aquatics Kalk+2 Kalkwasser Powder for Reef Aquariums, 450g" brand: "brightwell aquatics" price: "$65.79" currency: USD in_stock: true reviews_count: 9 category: "Brightwell Aquatics" url: https://www.desertcart.us/products/20790332-brightwell-aquatics-kalk-2-kalkwasser-powder-for-reef-aquariums-450g store_origin: US region: United States of America --- # Calcium, Strontium & Magnesium in aragonite ratios Stable pH & alkalinity support Premium American-made quality Brightwell Aquatics Kalk+2 Kalkwasser Powder for Reef Aquariums, 450g **Brand:** brightwell aquatics **Price:** $65.79 **Availability:** βœ… In Stock ## Summary > 🌊 Elevate Your Reef Game with Kalk+2 – The Ultimate Mineral Boost for Coral Champions! ## Quick Answers - **What is this?** Brightwell Aquatics Kalk+2 Kalkwasser Powder for Reef Aquariums, 450g by brightwell aquatics - **How much does it cost?** $65.79 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/20790332-brightwell-aquatics-kalk-2-kalkwasser-powder-for-reef-aquariums-450g) ## Best For - brightwell aquatics enthusiasts ## Why This Product - Trusted brightwell aquatics brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Chloride-Free Purity:** No added chlorides or unwanted saltsβ€”safe, clean supplementation for sensitive marine life. - β€’ **Proudly Made in the USA:** Crafted with care and innovation, ensuring premium quality for your reef’s health and longevity. - β€’ **Reef-Ready Mineral Blend:** Precisely balanced calcium, strontium, and magnesium mimic natural aragonite for vibrant coral growth. - β€’ **pH & Alkalinity Guardian:** Maintains optimal pH and temporary alkalinity to keep your reef ecosystem thriving and stable. - β€’ **Scientifically Engineered Formula:** Developed by marine scientists to outperform traditional kalkwasser supplements with proven results. ## Overview Brightwell Aquatics Kalk+2 is a premium powdered kalkwasser supplement delivering essential calcium, strontium, and magnesium in natural aragonite ratios. Designed to stabilize pH and alkalinity without adding harmful chlorides, this American-made formula supports faster coral growth and healthier reef ecosystems. Ideal for experienced reef hobbyists seeking scientifically backed, high-quality water treatment to optimize marine invertebrate vitality. ## Description Brightwell Aquatics Kalk+2 is an advanced Kalkwasser-based powdered supplement designed to provide essential calcium, strontium, and magnesium for reef aquariums. These elements are crucial for the formation of aragonite, the skeletal material of reef-building invertebrates like corals, clams, and calcareous algae. Unlike traditional calcium supplements, Kalk+2 does not contain chloride salts, making it a safer choice for reef aquariums. It also helps regulate pH and temporary alkalinity, maintaining stable conditions for your marine life. Kalk+2 is formulated by a marine scientist and is ideal for experienced hobbyists who are familiar with kalkwasser products. Brightwell Aquatics Kalk+2 is designed to support the building blocks of coral formation and vibrant reef ecosystems. By supplementing with this product, you can ensure that your reef tank is optimized for the best possible environment for your marine life. Review: Works Perfectly Just Be Careful With Amount Used - I had wanted to bump pH up from 7.9 to 8.3 for over a year because they say you get faster coral growth (BRS did a side-by-side experiment couple months ago out there on YT) but never had much luck breaking 8 with Kents or Seachem products - plus was leery of nuking the tank by accidentally overdosing with homebrewed kalkwasser. Started off using less than recommended Kalk in a big bucket of RODI and didn't touch it for a day to let everything settle. I then carefully did manual top offs from the bucket (stay away from the sediment) over the course of a week and was shocked when the pH came out at 8.4 that weekend (100g system and had planned on slowly raising over 2-3 weeks). That was about 2 months ago, and I've since been able to maintain at 8.3 just as hoped for. Finding that sweet spot in your parameters really does seem to boost SPS growth to the point that you can literally see montis getting bigger every day as opposed to weekly. Highly recommend - but for the love of your tank, use less than you think you need and take it slow. Review: Works great. - Does what kalk does in a reef tank. Has the extra elements as a bonus which is nice. High quality and clean. Keeps my reef going and my sps happy. ## Features - ESSENTIAL CALCIUM, STRONTIUM & MAGNESIUM: Brightwell Aquatics Kalk+2 provides the necessary calcium, strontium, and magnesium in the same ratios found in aragonite, supporting healthy reef-building invertebrates like corals, clams, and calcareous algae. - MAINTAINS pH & ALKALINITY: Brightwell Aquatics Kalk+2 helps maintain a stable pH within the optimal range while temporarily supporting alkalinity levels, promoting a balanced and thriving reef environment. - NO CHLORIDE ADDED: Unlike other calcium supplements, Brightwell Aquatics Kalk+2 does not contain chloride or any other conservative elements, making it a safer choice for hobbyists who want to avoid additional salts in their aquarium. - PROVEN FORMULA FOR REEF KEEPERS: Brightwell Aquatics Kalk+2 improves upon traditional calcium supplement formulas, offering a more effective and scientifically-backed solution for aquarium hobbyists. - AMERICAN-MADE EXCELLENCE – Brightwell Aquatics is an industry-leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we consistently deliver advanced superior quality solutions to elevate the vibrancy and health of your aquarium. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00BUFTC5S | | Allergen Information | Sulphites Free | | Best Sellers Rank | #56,559 in Pet Supplies ( See Top 100 in Pet Supplies ) #537 in Aquarium Water Treatments | | Brand | Brightwell Aquatics | | Brand Name | Brightwell Aquatics | | Customer Reviews | 4.6 out of 5 stars 239 Reviews | | Global Trade Identification Number | 00810086011155 | | Included Components | Kalk+2 | | Item Form | Powder | | Item Type Name | WATER CONDITIONER | | Item Weight | 1 Pounds | | Liquid Volume | 1 Gallons | | Manufacturer | TopDawg Pet Supply | | Manufacturer Part Number | KALK450 | | Model Number | KALK450 | | Target Species | Invertebrates | | UPC | 810086011155 | | Unit Count | 1 Count | ## Product Details - **Brand:** Brightwell Aquatics - **Item Form:** Powder - **Item Weight:** 16 ounces - **Liquid Volume:** 1 Gallons - **Manufacturer:** TopDawg Pet Supply ## Images ![Brightwell Aquatics Kalk+2 Kalkwasser Powder for Reef Aquariums, 450g - Image 1](https://m.media-amazon.com/images/I/61dSH2qaTcL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works Perfectly Just Be Careful With Amount Used *by T***N on June 13, 2019* I had wanted to bump pH up from 7.9 to 8.3 for over a year because they say you get faster coral growth (BRS did a side-by-side experiment couple months ago out there on YT) but never had much luck breaking 8 with Kents or Seachem products - plus was leery of nuking the tank by accidentally overdosing with homebrewed kalkwasser. Started off using less than recommended Kalk in a big bucket of RODI and didn't touch it for a day to let everything settle. I then carefully did manual top offs from the bucket (stay away from the sediment) over the course of a week and was shocked when the pH came out at 8.4 that weekend (100g system and had planned on slowly raising over 2-3 weeks). That was about 2 months ago, and I've since been able to maintain at 8.3 just as hoped for. Finding that sweet spot in your parameters really does seem to boost SPS growth to the point that you can literally see montis getting bigger every day as opposed to weekly. Highly recommend - but for the love of your tank, use less than you think you need and take it slow. ### ⭐⭐⭐⭐⭐ Works great. *by N***S on May 27, 2024* Does what kalk does in a reef tank. Has the extra elements as a bonus which is nice. High quality and clean. Keeps my reef going and my sps happy. ### ⭐⭐⭐⭐⭐ Does the job *by S***L on December 22, 2023* Kinda pricy if you have a larger tank, but would be great for a smaller reef. Got this in a bind so I could get it next day and I will say it absolutely works and kept my tank stable . Potent stuff as well . Had to use slightly less then I was using standard kalk with the same results. Big plus on the added mag as well. I would say if you have a smaller or low demand larger tank this will absolutely work! ## Frequently Bought Together - Brightwell Aquatics Kalk+2 - Advanced Calcium, Magnesium & Strontium Powdered Kalkwasser Supplement for Marine Fish and Aquariums - Red Sea Reef Energy Plus 1000ml (AB+) All in One Coral Food for Saltwater Aquarium Marine Reef Tanks | Food for Soft, LPS, SPS, and Non-Photosynthetic Corals - Brightwell Aquatics Replenish - Advanced Trace and Minor Element Supplement for Marine Fish and Reef Aquarium 500-ml --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/20790332-brightwell-aquatics-kalk-2-kalkwasser-powder-for-reef-aquariums-450g](https://www.desertcart.us/products/20790332-brightwell-aquatics-kalk-2-kalkwasser-powder-for-reef-aquariums-450g) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-10*