--- product_id: 1627406 title: "Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums" brand: "red sea" price: "฿3146" currency: THB in_stock: true reviews_count: 8 url: https://www.desertcart.co.th/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium store_origin: TH region: Thailand --- # Supports vibrant coral skeletons Precise Ca/Sr ratio blend Easy 1mL/25 gal dosing Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums **Brand:** red sea **Price:** ฿3146 **Availability:** ✅ In Stock ## Summary > 🌟 Elevate your reef game with precision calcium care! ## Quick Answers - **What is this?** Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums by red sea - **How much does it cost?** ฿3146 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium) ## Best For - red sea enthusiasts ## Why This Product - Trusted red sea brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Dosing:** Liquid formula allows exact control to maintain ideal calcium levels - • **Seamless Integration:** Works perfectly with Red Sea’s Foundation B & C for reef stability - • **Effortless Maintenance:** Simple weekly dosing keeps your reef thriving without guesswork - • **Trusted by Reef Enthusiasts:** 4.7-star rating from 250+ reviews proves consistent performance - • **Balanced Coral Growth Formula:** Optimized calcium and strontium blend for robust skeleton development ## Overview Red Sea Reef Foundation A is a 500ml liquid supplement delivering a scientifically balanced calcium and strontium formula designed to promote healthy coral skeleton growth. Part of the comprehensive Red Sea Reef Care Program, it ensures stable reef conditions when used alongside Foundation B and C. Easy to dose at 1mL per 25 gallons, it offers precise control to maintain optimal calcium levels, backed by a strong 4.7-star user rating. ## Description desertcart.com : Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums : Petsuppliesmisc : Pet Supplies Review: Great - Love this product corals love i will keep buying Review: Works as expected! - I just started my first reef aquarium a few months ago and noticed the other day that the calcium level in the water had dropped to 350 ppm. I measured the necessary amount of supplement according to the directions on the bottle and added it to the tank. Easy. I did another calcium tests a few minutes ago and the levels rose from 350 to 440 which is exactly what I wanted. Now that my calcium level is where I need it, I can just use this product to dose every week to keep the levels up. Highly recommend. ## Features - Supports Coral Skeleton Formation: Red Sea Reef Foundation A provides a blended supplement of calcium and strontium in the correct ratios to encourage and support the healthy growth and development of coral skeletons. - Part of a Complete Program: This supplement is a key component of the comprehensive Red Sea Reef Care Program, designed to work in conjunction with Foundation B (Alkalinity) and Foundation C (Magnesium) for a balanced and stable reef environment. - Easy to Dose and Maintain: The liquid formula is easy to dose, allowing for precise control of calcium levels. The recommended dosage is 1mL per 25 gallons of water to raise the calcium level by 2 ppm, making it simple to maintain optimal conditions for your corals. ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | Red Sea | | Customer Reviews | 4.7 out of 5 stars 250 Reviews | | Item Form | Liquid | | Item Weight | 0.77 Kilograms | | Liquid Volume | 500 Milliliters | | Manufacturer | Red Sea | | UPC | 730773220137 | ## Product Details - **Brand:** Red Sea - **Item Form:** Liquid - **Item Weight:** 0.77 Kilograms - **Liquid Volume:** 500 Milliliters - **Manufacturer:** Red Sea ## Images ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 1](https://m.media-amazon.com/images/I/81c7ZUzhmFL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 2](https://m.media-amazon.com/images/I/51FUuu6hZEL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 3](https://m.media-amazon.com/images/I/819bAaLQeGL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 4](https://m.media-amazon.com/images/I/61doThkf+vL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 5](https://m.media-amazon.com/images/I/813S2x5uOnL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great *by R***Y on October 15, 2025* Love this product corals love i will keep buying ### ⭐⭐⭐⭐⭐ Works as expected! *by J***M on October 19, 2017* I just started my first reef aquarium a few months ago and noticed the other day that the calcium level in the water had dropped to 350 ppm. I measured the necessary amount of supplement according to the directions on the bottle and added it to the tank. Easy. I did another calcium tests a few minutes ago and the levels rose from 350 to 440 which is exactly what I wanted. Now that my calcium level is where I need it, I can just use this product to dose every week to keep the levels up. Highly recommend. ### ⭐⭐⭐⭐⭐ Quality brand *by J***E on May 27, 2024* As expected --- ## 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.co.th/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium](https://www.desertcart.co.th/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-28*