---
product_id: 345245904
title: "Reef Builder, 4 kg / 8.8 lbs"
brand: "seachem"
price: "52514 kr"
currency: ISK
in_stock: true
url: https://www.desertcart.is/products/345245904-reef-builder-4-kg-8-8-lbs
store_origin: IS
region: Iceland
---

# 4 kg powder for sustained dosing stabilizes pH 8.3 long-term 12 me alkalinity/g Reef Builder, 4 kg / 8.8 lbs

**Brand:** seachem
**Price:** 52514 kr
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your reef’s vitality—because your corals deserve the best!

## Quick Answers

- **What is this?** Reef Builder, 4 kg / 8.8 lbs by seachem
- **How much does it cost?** 52514 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/345245904-reef-builder-4-kg-8-8-lbs)

## 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

- • **Coral Growth Essential:** Supplies vital carbonates without depleting calcium, magnesium, or strontium—key to vibrant corals.
- • **Long-Term pH Stability:** Gradually stabilizes your reef’s pH around the optimal 8.3, ensuring a thriving ecosystem.
- • **Safe & Balanced Formula:** Formulated to avoid harmful precipitation; pairs perfectly with calcium supplements when dosed correctly.
- • **Precision Alkalinity Boost:** Delivers 12 me alkalinity per gram to fuel coral growth without sudden pH spikes.
- • **Bulk Supply for Serious Reefers:** Generous 4 kg size supports consistent maintenance, keeping your reef flourishing day after day.

## Overview

Seachem Reef Builder is a 4 kg powder designed to raise carbonate alkalinity in reef aquariums without causing immediate pH shifts. It supports coral health by providing essential carbonates while maintaining calcium, magnesium, and strontium levels. With long-term use, it stabilizes pH near 8.3, promoting sustained coral growth and reef vitality.

## Description

Reef Builder, 4 kg / 8.8 lbs

## Features

- Raises Carbonate Alkalinity In The Reef Aquarium Without Immediate Impact On Ph.
- With Long Term Use Reef Builder Will Stabilize Ph.
- Carbonates and calcium are essential to all coral growth, if either becomes deficient, coral growth will cease, followed by a rapid decline in health
- Used As Directed, Reef Builder Will Not Deplete Calcium, Magnesium, Or Strontium Which Usually Tend To Precipitate With Increasing Alkalinity

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 20.32 x 20.32 x 19.05 cm; 4 kg |
| Item model number | 369 |
| Pet Life Stage | all stages |
| Item Form | Powder |
| Allergen Information | Yam Free |
| Color | white |
| Size | 4 kg / 8.8 lbs |
| Number of Items | 1 |
| Quantity | 1 |
| batteries required | No |
| Batteries Included | No |
| External Testing Certification | Não aplicável |
| Item Weight | 4 Kilograms |

## Product Details

- **Brand:** Seachem
- **Liquid volume:** 250 Milliliters
- **Item weight:** 4 Kilograms
- **Item form:** Powder
- **Manufacturer:** Seachem Laboratories, Inc.

## Images

![Reef Builder, 4 kg / 8.8 lbs - Image 1](https://m.media-amazon.com/images/I/81SASa4yOFL.jpg)

## Available Options

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

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**Shop now:** [https://www.desertcart.is/products/345245904-reef-builder-4-kg-8-8-lbs](https://www.desertcart.is/products/345245904-reef-builder-4-kg-8-8-lbs)

---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-28*