---
product_id: 10280597
title: "Reef Carbonate 500ml"
brand: "seachem"
price: "₱1706"
currency: PHP
in_stock: true
reviews_count: 10
category: "Seachem"
url: https://www.desertcart.ph/products/10280597-reef-carbonate-500ml
store_origin: PH
region: Philippines
---

# pK ~9.0 stabilizes reef pH blend of carbonate & bicarbonate salts 4,000 meq/L concentration Reef Carbonate 500ml

**Brand:** seachem
**Price:** ₱1706
**Availability:** ✅ In Stock

## Summary

> 🪸 Elevate your reef’s vitality with science-backed alkalinity mastery!

## Quick Answers

- **What is this?** Reef Carbonate 500ml by seachem
- **How much does it cost?** ₱1706 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/10280597-reef-carbonate-500ml)

## 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

- • **Elementally Safe:** Formulated to avoid depletion of calcium, magnesium, and strontium—protecting your reef’s balance.
- • **pH Stability Champion:** Unique carbonate/bicarbonate blend maintains optimal reef pH around 8.3-8.4, unlike competitors.
- • **Coral Growth Essential:** Supports healthy coral development by preventing carbonate deficiency.
- • **Easy & Reliable Dosing:** Simple twice-weekly dosing with clear instructions keeps your reef thriving without guesswork.
- • **Precision Alkalinity Boost:** Concentrated 4,000 meq/L formula ensures rapid and effective KH restoration.

## Overview

Seachem Reef Carbonate 500ml is a highly concentrated (4,000 meq/L) blend of carbonate and bicarbonate salts designed to restore and maintain optimal alkalinity (KH) in reef aquariums. Its unique formulation stabilizes pH around 8.3-8.4, promoting healthy coral growth without depleting essential minerals like calcium and magnesium. Trusted by reef enthusiasts for easy dosing and reliable results, it’s a must-have for sustaining vibrant, thriving coral ecosystems.

## Description

Reef Carbonate™ is a concentrated (4,000 meq/L) optimized blend of carbonate and bicarbonate salts designed to restore and maintain alkalinity in the reef aquarium. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. To prevent this you must provide carbonates (Reef Carbonate™) and calcium (Reef Advantage Calcium™ or Reef Complete®). Whereas competing products simply use sodium bicarbonate, Reef Carbonate™ is made with a blend of carbonate and bicarbonate salts. This blend of salts results in Reef Carbonate™ yielding a pK of roughly 9.0 in saltwater (higher than competing products). In a closed reef system, the multitude of organics produced by reef inhabitants tends to force pH downward, but the advantage of Reef Carbonate’s™ higher pK is a stabilization of pH around 8.3-8.4. Competing products’ formulations make them incapable of such a claim, so pH will always fall below desirable levels for a reef aquarium. Used as directed, Reef Carbonate™ will not deplete calcium, magnesium, or strontium which usually tend to precipitate with increasing alkalinity. Reef alkalinity should be maintained at 3–6 meq/L (8–17 dKH). Alkalinity should not be allowed to fall below 2 meq/L.

Review: Would recommend - Works perfect. Directions are easy and it didn’t mess with any of my other elements
Review: It is really good I will be getting more - This is all I use now it works perfect never had any trouble with any product from these guys I would highly recommend if your receiver

## Features

- Raises carbonate alkalinity (KH)
- Concentrated (4, 000 meq/L)
- Made with a blend of carbonate and bicarbonate salts

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002DGM5C |
| ASIN  | B0002DGM5C |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #40,703 in Pet Supplies ( See Top 100 in Pet Supplies ) #393 in Aquarium Water Treatments |
| Brand Name | Seachem |
| Color | clear |
| Customer Reviews | 4.7 4.7 out of 5 stars (411) |
| Date First Available | June 9, 2004 |
| Date First Available  | June 9, 2004 |
| Directions | Beginner Use 1 capful (5 mL) per 80 L (20 US gallons) twice a week. Best if diluted into a cup of freshwater, then added. Check alkalinity every 2 weeks and adjust amount or frequency accordingly. Advanced Check alkalinity (use MultiTest™ Marine pH & Alkalinity to test alkalinity levels), then follow addition regimen above until alkalinity is adjusted to 4–5 meq/L. Each mL contains a minimum of 4 … |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 7.6 x 2.1 x 1.5 inches |
| Item Package Dimensions L x W x H | 7.48 x 2.36 x 2.28 inches |
| Item Weight | 1.35 Pounds |
| Item model number | 663 |
| Item model number  | 663 |
| Manufacturer | Seachem Laboratories, Inc. |
| Manufacturer  | Seachem Laboratories, Inc. |
| Material | cotton |
| Model Name | Reef Carbonate 500ml |
| Number of Items | 1 |
| Product Dimensions  | 7.6 x 2.1 x 1.5 inches; 1.35 Pounds |
| Size | 100 mL, 250 mL, 500 mL, 2 L, 4 L |
| Specific Uses for Product | Active |
| Target Audience Keyword | fish; all fish |
| Warranty Description | As Labeled |

## Product Details

- **Brand:** Seachem
- **Item Form:** Liquid
- **Item Weight:** 1.35 Pounds
- **Liquid Volume:** 500 Milliliters
- **Manufacturer:** Seachem Laboratories, Inc.

## Images

![Reef Carbonate 500ml - Image 1](https://m.media-amazon.com/images/I/71zSFL5ZOBL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Can this be used in a fresh water aquarium for raising KH? Thanks**
A: I would not use this in a freshwater tank. If you are worried about hard/soft water or you want a ph change for a special plant. I suggest you put a baggy of crushed coral in your filter and let that dissolve over time and repeat every few months. However having both a large reef aquarium as well as a smaller freshwater aquarium I have never really had to worry about my KH in my freshwater. In fact I use no chemicals in my freshwater tank as it's so easily self sustaining. Also not trying to sound like a jerk here but it's gonna come out that way I am sure, but if something says REEF or SALTWATER don't put it in freshwater. There are only a few things that can be used in both and this isn't one of them. Ben

**Q: Will I still need to add a pH buffer to supplement this product?**
A: NO---This product will maintain the necessary alkalinity and ph

**Q: My small bio cube has a kh of 7.3 and calcium at 390 i own a bottle of reef carbonate is there something else i should also buy to get this in check?**
A: I use the reef carbonate to increase my KH.. I keep my KH around 10 in my 93 gal mixed reef.   You should try to keep kh above 8 if you have hard corals imo.  Reef carbonate does not contain any calcium so you need another source.   I use ESV b-ionic calcium to maintain my ca level at 450 or higher.  Hope this helps

**Q: What's the difference between this and Seachem Liquid Marine Buffer?**
A: The liquid marine buffer is to keep your ph stable. Weather ho or low. The carbonate is for the coral growth and health. Your ph levels are very important to your corals growth and health as well. Through my experience use both as needed

## Customer Reviews

### ⭐⭐⭐⭐⭐ Would recommend
*by J***O on June 16, 2025*

Works perfect. Directions are easy and it didn’t mess with any of my other elements

### ⭐⭐⭐⭐⭐ It is really good I will be getting more
*by C***S on May 17, 2025*

This is all I use now it works perfect never had any trouble with any product from these guys I would highly recommend if your receiver

### ⭐⭐⭐⭐⭐ As described
*by D***E on October 8, 2024*

Best alk supplement for the price. I have used it in my reef tank and it was great. Fish are okay. PH level depends on dosing amount. Product does not leak and is safe use. Functions good.

## Frequently Bought Together

- Seachem Reef Carbonate 500ml
- Seachem Reef Complete 500ml
- Seachem Reef Plus 500ml

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*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-02-10*