---
product_id: 801830049
title: "Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums"
brand: "red sea"
price: "€ 60.63"
currency: EUR
in_stock: false
reviews_count: 10
url: https://www.desertcart.gr/products/801830049-reef-foundation-a-ca-sr-supplement-500ml-calcium-and-strontium
store_origin: GR
region: Greece
---

# Liquid formula for easy, accurate dosing Precise Ca/Sr ratio for coral skeleton strength Balances reef chemistry with Foundation B & C Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums

**Brand:** red sea
**Price:** € 60.63
**Availability:** ❌ Out of Stock

## Summary

> 🌊 Elevate Your Reef Game — Because Your Corals Deserve the Best!

## Quick Answers

- **What is this?** 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?** € 60.63 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/801830049-reef-foundation-a-ca-sr-supplement-500ml-calcium-and-strontium)

## 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

- • **Compact Powerhouse:** 500ml bottle packs potent reef support in a sleek, easy-to-store design.
- • **Complete Reef Harmony:** Works seamlessly with Red Sea’s Foundation B & C for a stable, thriving ecosystem.
- • **Effortless Precision Dosing:** 1mL per 25 gallons raises calcium by 2 ppm—simple, measurable, reliable.
- • **Sculpt Your Reef’s Future:** Optimized calcium and strontium blend fuels robust coral skeleton growth.
- • **Trusted by Reef Enthusiasts:** Highly rated with 4.7 stars and proven results in real reef tanks.

## Overview

Red Sea Reef Foundation A is a scientifically formulated liquid supplement delivering calcium and strontium in ideal ratios to promote healthy coral skeleton growth. Designed for easy dosing and integration with Red Sea’s complete reef care system, it ensures balanced water chemistry and vibrant marine ecosystems. Trusted by hobbyists for precise control and consistent results.

## 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 |
|---------------|-------|
| ASIN | B004E47QSC |
| Best Sellers Rank | #144,842 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,275 in Aquarium Water Treatments |
| Brand | Red Sea |
| Brand Name | Red Sea |
| Customer Reviews | 4.8 out of 5 stars 250 Reviews |
| Global Trade Identification Number | 00730773220137 |
| Item Form | Liquid |
| Item Weight | 0.77 Kilograms |
| Liquid Volume | 500 Milliliters |
| Manufacturer | Red Sea |
| Manufacturer Part Number | Red Sea Reef Foundation A Supplement (Ca |
| Model Number | Red Sea Reef Foundation A Supplement (Ca |
| Target Species | Coral |
| UPC | 730773220137 |
| Unit Count | 16.9 Fluid Ounces |

## Product Details

- **Brand:** Red Sea
- **Item Form:** Liquid
- **Item Weight:** 0.77 Kilograms
- **Liquid Volume:** 500 Milliliters
- **Manufacturer:** Red Sea

## Images

![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)

## 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

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**Shop now:** [https://www.desertcart.gr/products/801830049-reef-foundation-a-ca-sr-supplement-500ml-calcium-and-strontium](https://www.desertcart.gr/products/801830049-reef-foundation-a-ca-sr-supplement-500ml-calcium-and-strontium)

---

*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-07-16*