--- product_id: 113936523 title: "Seachem Reef Calcium Liquid Organic Source, 250 ml" brand: "seachem" price: "€ 47.26" currency: EUR in_stock: true reviews_count: 5 category: "Seachem" url: https://www.desertcart.be/products/113936523-seachem-reef-calcium-liquid-organic-source-250-ml store_origin: BE region: Belgium --- # organic polygluconate complex for bioavailability 50,000 mg/L concentrated calcium maintains calcium without altering pH Seachem Reef Calcium Liquid Organic Source, 250 ml **Brand:** seachem **Price:** € 47.26 **Availability:** ✅ In Stock ## Summary > 🌊 Elevate Your Reef’s Radiance with Every Drop! ## Quick Answers - **What is this?** Seachem Reef Calcium Liquid Organic Source, 250 ml by seachem - **How much does it cost?** € 47.26 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/113936523-seachem-reef-calcium-liquid-organic-source-250-ml) ## Best For - seachem enthusiasts ## Why This Product - Trusted seachem brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **pH-Stable Reef Support:** Maintains optimal calcium levels without disrupting your tank’s delicate pH balance. - • **Algae-Free Growth Catalyst:** No nitrogen or phosphorus means zero risk of unwanted algae blooms in your reef system. - • **Organic Bioavailable Formula:** Polygluconate complex ensures maximum calcium absorption with minimal energy expenditure for corals. - • **Ultra-Concentrated Calcium Boost:** Delivers a potent 50,000 mg/L calcium dose to supercharge coral growth. - • **Precision Dosing for Peak Performance:** Easily controlled dosing raises calcium by 3 mg/L per capful, letting you tailor coral growth without overdosing. ## Overview Seachem Reef Calcium Liquid is a 250 ml ultra-concentrated organic calcium supplement (50,000 mg/L) designed to maintain stable calcium levels in reef aquariums. Its unique polygluconate complex enhances bioavailability and coral growth without altering pH or promoting algae, making it the smart choice for professional reef keepers aiming for vibrant, healthy corals. ## Description Product Description Reef Calcium is a concentrated (50,000 mg/L) bioavailable polygluconate complexed calcium intended to maintain calcium in the reef aquarium without altering pH. Additionally, polygluconate contains no nitrogen or phosphorous, thus it is biologically impossible for it to lead to algae growth in a properly maintained reef system. Polygluconate complexation confers several benefits: it increases the bioavailability of the calcium, it provides a rich source of metabolic energy to help maintain peak coral growth, and it prevents calcium precipitation/alkalinity depletion. Reef Calcium utilizes a chained organic calcium rather than an ionic calcium. When a coral absorbs a molecule into its tissue, it uses the same amount of energy regardless of molecular size. However, charged molecules require more energy. When an uncharged molecule of Reef Calcium is absorbed, the coral acquires multiple calcium atoms as well as an easily metabolized carbohydrate with less energy expended than it uses for ionic calcium uptake. Therefore, at lower calcium levels, corals can still take in as much calcium through our organic chains as they would at much higher levels of ionic calcium. Ingredients calcium gluconate Directions Add 1 capful (5 mL) per 80 L (20 US gallons) twice a week. You can increase the amount or frequency based on growth response but do not exceed 3 capfuls per 80 L (20 gallons) per day. Each capful will raise calcium by about 3 mg/L. Notes: Use the Reef Status: Calcium test kit to measure calcium. It is not necessary to exceed 380 mg/L total calcium when using this product. Color and clarity may vary between lots. Water Volume Units US Gallons Liters Current Ca mg/L (ppm) Desired Ca mg/L (ppm) To reach your desired level use mL ( caps) Do not exceed 15 mL per 80 L (20 US gallons) per day Considerations Use Reef Status Calcium to test calcium levels. We recommend a Ca level between 380-420 mg/L with an alkalinity between 3-6 meq/L (8-17 dKH). It is advisable to make large adjustments slowly to avoid overshooting intended level or shocking corals and inverts. DO NOT OVERDOSE Do not exceed 15 mL per 80 L (20 US gallons) per day. 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. Box Contains water treatment Review: Used for Freshwater Snails - Used it for baby mystery snails in a separate tank after my big ones laid eggs in my main tank, The Parents had big patches of missing shell and harsh growth and I wanted to make sure they didn't have the same problem. After a few months, they have grown to the size of a grape and have no patches yet. Review: Item bot properly sealed - Ordered this item and seal was undone and product leaked in shipping bag and all over bottle. Was sent replacement for item and same issues except the whole contents of bottle was in shipping bag. ## Features - Warning:Not suitable for children under 10 months. - Liquid organic calcium source - Maintains calcium and accelerates coral growth - Concentrated (50,000 mg/L) ## Technical Specifications | Specification | Value | |---------------|-------| | Pet Type | Fish | | Product Dimensions | 13.72 x 4.06 x 3.3 cm; 340.19 g | | Item model number | 356 | | Item Form | Liquid | | Allergen Information | Allergen-Free | | Colour | Multi-colored | | Size | 250 ml | | Volume | 250 Millilitres | | Number of Items | 1 | | Quantity | 1 | | Specific Uses | Coat | | Batteries required | No | | Batteries Included | No | | External Testing Certification | Não aplicável | | EU Energy Efficiency Label | A+, B | | Item Weight | 340 g | ## Product Details - **Brand:** Seachem - **Liquid volume:** 250 Millilitres - **Item weight:** 340 g - **Item form:** Liquid - **Allergen information:** Allergen-Free ## Images ![Seachem Reef Calcium Liquid Organic Source, 250 ml - Image 1](https://m.media-amazon.com/images/I/71iMUAf13+L.jpg) ![Seachem Reef Calcium Liquid Organic Source, 250 ml - Image 2](https://m.media-amazon.com/images/I/71+jVAXDehL.jpg) ![Seachem Reef Calcium Liquid Organic Source, 250 ml - Image 3](https://m.media-amazon.com/images/I/81Bi7MUbGtL.jpg) ![Seachem Reef Calcium Liquid Organic Source, 250 ml - Image 4](https://m.media-amazon.com/images/I/31W+FWcbBDL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Used for Freshwater Snails *by N***S on 2 September 2022* Used it for baby mystery snails in a separate tank after my big ones laid eggs in my main tank, The Parents had big patches of missing shell and harsh growth and I wanted to make sure they didn't have the same problem. After a few months, they have grown to the size of a grape and have no patches yet. ### ⭐ Item bot properly sealed *by K***N on 12 February 2026* Ordered this item and seal was undone and product leaked in shipping bag and all over bottle. Was sent replacement for item and same issues except the whole contents of bottle was in shipping bag. ### ⭐⭐⭐⭐⭐ Long Time Aquarium Owner *by S***R on 15 June 2026* Excellent for removing chlorine, etc. I let it sit in a gallon jug for an hour after swirling around the water. Amazing. As soon as you add it to the water the chlorine smell disappears. ## Frequently Bought Together - Seachem Reef Calcium 250ml - Brightwell Aquatics Magnesion Liquid Salt Water Conditioner - Concentrated Magnesium Supplement For Reef and Marine Aquariums, 8.45 fl oz - Brightwell Aquatics - Alkalin8.3 Concentrated KH Buffer Supplement - for All Marine Fish and Reef Aquaria - Aquarium Water Treatments, 8.45 fl oz --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/113936523-seachem-reef-calcium-liquid-organic-source-250-ml](https://www.desertcart.be/products/113936523-seachem-reef-calcium-liquid-organic-source-250-ml) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-07-30*