---
product_id: 1627531
title: "NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water"
brand: "red sea"
price: "VT12724"
currency: VUV
in_stock: true
reviews_count: 11
category: "Red Sea"
url: https://www.desertcart.vu/products/1627531-no3-po4-x-500ml-nopox-nitrate-and-phosphate-reducer-reef
store_origin: VU
region: Vanuatu
---

# Compact 3.15x7.87x3.15 in 500ml precision dosing Made in USA quality NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water

**Brand:** red sea
**Price:** VT12724
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your reef game — clarity and coral health in every drop!

## Quick Answers

- **What is this?** NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water by red sea
- **How much does it cost?** VT12724 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/1627531-no3-po4-x-500ml-nopox-nitrate-and-phosphate-reducer-reef)

## 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

- • **Trusted & Tested by Pros:** Top-rated with 4.6 stars and a loyal millennial reef-keeper following.
- • **Clearer Water, Less Algae:** Clinically proven to enhance water clarity and control nuisance algae growth.
- • **Boosts Vibrant Coral Growth:** Promotes healthier coral polyp extension for that enviable reef glow.
- • **Easy Carbon Dosing Simplified:** Proprietary carbon blend makes complex dosing foolproof for busy reef managers.
- • **Precision Nitrate & Phosphate Control:** Scientifically formulated to reduce harmful nitrates & phosphates, keeping your reef pristine.

## Overview

Red Sea NO3:PO4-X is a 500ml US-made biological nitrate and phosphate reducer designed for reef aquariums. It uses a proprietary carbon dosing formula to lower nitrate and phosphate levels, promoting clearer water, healthier coral growth, and effective algae control. Ideal for professional reef keepers seeking a reliable, easy-to-use supplement to maintain optimal aquarium conditions.

## Description

Red Sea Fish Pharm ARE22203 NO3: PO4-X Biological Nitrate and Phosphate Reducer for Aquarium, 500ml

Review: Seems to be effective, but READ the instructions completely - I recently suffered a massive system crash due to high phosphates leaching into my topoff water from the reservoir. I decided to add Red Sea NO3:PO4-X Nitrate & Phosphate Reducer to my repair plan and just see how it went. Now, bear in mind that this was just ONE PART of a multi-step battle plan, so I can't say for sure what worked better, or if anything was useless, or if this was all just blind luck by a dumb guy with a tank, but who knows. I do think it helped, so here's my review: Naturally, desertcart shipping was quick. I read the rest of the reviews, some good, some bad, and decided to give it a go. First off, be sure to read the entire instruction packet. It might seem silly, but there are different dosing regimens for different things you want to do to your tank, so read 'em. When I opened the bottle, I was assaulted by the heady aroma of vinegar and....SOMETHING. Something alcoholic, I think. Yep, you guessed correctly....this stuff is basically a "proprietary blend" of carbon sources. In other words, this is carbon-dosing for idjits. I have no problem with this. I have been afraid of carbon dosing because it seems too fiddly. This product dumbs it down for the rest of us and makes it a relatively easy task. The only thing you need to know about carbon dosing, though, is that once you start, you need to make sure it's done daily. If you decide to stop you need to wean the tank off of it. It's going to promote extra bacterial growth, which will in turn metabolize phosphates and nitrates and bring those terrifying numbers back into an acceptable range. The product claims that this will also promote clarity of the water and greater polyp extension. Well, it's been a few weeks since I started, and I can definitely see a lot of improvement. Dunno if it's the GFO, the UV filter, the massive water change, the Red Sea Reducer, or (most likely) a combination off all of the above. But I DO see much clearer water and coral polyp extension has been great, so I'm gonna go ahead and call that a win for this particular product. My phosphates have dropped from 0.18 on a Hanna checker down to 0.02, and my tank is back to happy again. I'd recommend this product, but I want people to be aware that this IS a carbon dosing source, and those instructions have to be fully read and understood before you start.
Review: It really works! - It took a while to arrive and based on what I read online I started slowly using about 1/2 the recommended dosage. It worked a little, so I increased the dosage to recommended levels. Wow! It works great and has reduced the nitrate level in my fish only tank considerably and my algae problem is under control. Note, I dosed by hand daily as I do not have a dosing pump.

## Features

- Country Of Origin: United States
- The Package Length Of The Product Is 3 Inches
- The Package Width Of The Product Is 3 Inches
- The Package Height Of The Product Is 8 Inches

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006L48D3U |
| ASIN  | B006L48D3U |
| Age Range Description | Adolescent |
| Best Sellers Rank | #38,130 in Pet Supplies ( See Top 100 in Pet Supplies ) #356 in Aquarium Water Treatments |
| Brand Name | Red Sea |
| Country of Origin | United States |
| Customer Reviews | 4.6 4.6 out of 5 stars (575) |
| Date First Available | December 10, 2010 |
| Date First Available  | December 10, 2010 |
| Directions | use as directed |
| Included Components | PHL306049 |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 3.15 x 7.87 x 3.15 inches |
| Item Package Dimensions L x W x H | 8.15 x 4.61 x 3.35 inches |
| Item Weight | 1 Pounds |
| Item model number | 306049 |
| Item model number  | 306049 |
| Manufacturer | TopDawg Pet Supply |
| Manufacturer  | TopDawg Pet Supply |
| Model Name | PHL306049 |
| Number of Items | 1 |
| Product Dimensions  | 3.15 x 7.87 x 3.15 inches; 1 Pounds |
| Size | 500-mL |
| Specific Uses for Product | aquarium supplement |
| Target Audience Keyword | fish |

## Product Details

- **Brand:** Red Sea
- **Item Form:** Liquid
- **Item Weight:** 1 Pounds
- **Liquid Volume:** 500 Milliliters
- **Manufacturer:** TopDawg Pet Supply

## Images

![NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water - Image 1](https://m.media-amazon.com/images/I/616rw6PL5yL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Seems to be effective, but READ the instructions completely
*by R***D on February 23, 2014*

I recently suffered a massive system crash due to high phosphates leaching into my topoff water from the reservoir. I decided to add Red Sea NO3:PO4-X Nitrate & Phosphate Reducer to my repair plan and just see how it went. Now, bear in mind that this was just ONE PART of a multi-step battle plan, so I can't say for sure what worked better, or if anything was useless, or if this was all just blind luck by a dumb guy with a tank, but who knows. I do think it helped, so here's my review: Naturally, Amazon shipping was quick. I read the rest of the reviews, some good, some bad, and decided to give it a go. First off, be sure to read the entire instruction packet. It might seem silly, but there are different dosing regimens for different things you want to do to your tank, so read 'em. When I opened the bottle, I was assaulted by the heady aroma of vinegar and....SOMETHING. Something alcoholic, I think. Yep, you guessed correctly....this stuff is basically a "proprietary blend" of carbon sources. In other words, this is carbon-dosing for idjits. I have no problem with this. I have been afraid of carbon dosing because it seems too fiddly. This product dumbs it down for the rest of us and makes it a relatively easy task. The only thing you need to know about carbon dosing, though, is that once you start, you need to make sure it's done daily. If you decide to stop you need to wean the tank off of it. It's going to promote extra bacterial growth, which will in turn metabolize phosphates and nitrates and bring those terrifying numbers back into an acceptable range. The product claims that this will also promote clarity of the water and greater polyp extension. Well, it's been a few weeks since I started, and I can definitely see a lot of improvement. Dunno if it's the GFO, the UV filter, the massive water change, the Red Sea Reducer, or (most likely) a combination off all of the above. But I DO see much clearer water and coral polyp extension has been great, so I'm gonna go ahead and call that a win for this particular product. My phosphates have dropped from 0.18 on a Hanna checker down to 0.02, and my tank is back to happy again. I'd recommend this product, but I want people to be aware that this IS a carbon dosing source, and those instructions have to be fully read and understood before you start.

### ⭐⭐⭐⭐⭐ It really works!
*by M***. on February 12, 2025*

It took a while to arrive and based on what I read online I started slowly using about 1/2 the recommended dosage. It worked a little, so I increased the dosage to recommended levels. Wow! It works great and has reduced the nitrate level in my fish only tank considerably and my algae problem is under control. Note, I dosed by hand daily as I do not have a dosing pump.

### ⭐⭐⭐⭐⭐ as I like to call it
*by C***D on April 18, 2016*

NOPOX, as I like to call it, has been an awesome maintenance addition to helping lower Nitrates in my aquariums. I have a tank that had 50ppm nitrates at one point and after 2-3 weeks it was cut nearly in half. Still got a ways to go, but the product works, as long as you religiously dose and follow the instructions to a T. You have to be very careful with this product, as overdosing could mean imminent death to your fish! Red Sea, however, provides very clear and easy instructions, along with an easy to handle measuring cup which helps with getting the right dosage. I'd recommend pouring this into your sump and not directly into your main display tank. Works well if you stick with it! Don't expect overnight results. These things take time!!

## Frequently Bought Together

- Red Sea NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water
- Red Sea Reef Energy Plus 500ml (AB+) All in One Coral Food for Saltwater Aquarium Marine Reef Tanks | Food for Soft, LPS, SPS, and Non-Photosynthetic Corals
- Tropic Marin All-for-Reef Liquid 500 ml.

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-03*