---
product_id: 53132383
title: "envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres"
brand: "envii"
price: "¥7991"
currency: JPY
in_stock: true
reviews_count: 8
url: https://www.desertcart.jp/products/53132383-envii-aquarium-klear-natural-bacteria-clears-green-water-treatment-crystal
store_origin: JP
region: Japan
---

# Up to 12 months treatment Clears 4,000L of green water Billions of natural bacteria envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres

**Brand:** envii
**Price:** ¥7991
**Availability:** ✅ In Stock

## Summary

> 💧 Clear water, happy fish, zero hassle – your aquarium’s new best friend!

## Quick Answers

- **What is this?** envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres by envii
- **How much does it cost?** ¥7991 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/53132383-envii-aquarium-klear-natural-bacteria-clears-green-water-treatment-crystal)

## Best For

- envii enthusiasts

## Why This Product

- Trusted envii brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-Lasting Value:** One 500ml bottle treats up to 4,000 litres, providing up to a year of crystal-clear water confidence.
- • **Effortless Maintenance:** Reduces filter clogging and tank cleaning frequency by naturally breaking down waste and toxins.
- • **Crystal Clear Every Time:** Harness billions of natural bacteria to banish green and murky water for a pristine aquarium view.
- • **Safe for All Aquatic Life:** Formulated with 100% natural ingredients, ensuring a toxin-free environment for your fish and plants.
- • **Precision Dosing Made Simple:** Built-in measuring chamber guarantees the perfect 5ml dose per 40L, no guesswork needed.

## Overview

Aquarium Klear is a 500ml natural bacteria-based treatment designed to clear green and murky water in fish tanks up to 4,000 litres. Safe for all aquatic life, it reduces tank and filter maintenance by breaking down waste and toxins naturally. Easy to dose with a built-in measuring chamber, it offers up to 12 months of effective algae prevention and crystal-clear water.

## Description

envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres

## Features

- Clears Green & Murky Water in Fish Tanks – Aquarium Klear contains billions of beneficial bacteria to clean green & murky water in fish tanks for crystal clear water.
- Safe for All Fish & Aquatic Life – Containing only natural ingredients, our aquarium treatment is safe for all fish & aquatic life including.
- Reduces Filter & Tank Maintanence - Naturally removes excess fish waste, fish food & harmful toxins. This ensures your filters run efficiently meaning less cleaning, tank maintanence and happier fish.
- Easy to Use – With a built-in measuring chamber, each treatment can be accurately measured and used with ease. Simply add 5ml of Aquarium Klear per 40 litres of fish tank water. All dosage instructions are on the bottle.
- Treatments – 500ml bottle is enough to treat 4,000 litres of aquarium water. This gives you multiple treatments to last up to 12 months.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Package Dimensions | 17.9 x 10.8 x 5.9 cm; 550 g |
| Item model number | AK01 |
| Pet Life Stage | All Life Stages |
| Item Form | Liquid |
| Allergen Information | Allergen-Free |
| Size | Aquarium Klear |
| Number of Items | 1 |
| Quantity | 1 |
| Specific Uses | Outdoor |
| Batteries required | No |
| Batteries Included | No |
| EU Energy Efficiency Label | A |
| Item Weight | 550 g |

## Product Details

- **Brand:** envii
- **Liquid volume:** 5E+2 Millilitres
- **Item weight:** 0.55 Kilograms
- **Item form:** Liquid
- **Manufacturer:** Bio8

## Images

![envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres - Image 1](https://m.media-amazon.com/images/I/61SrjSGk6WL.jpg)

## Available Options

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

## Questions & Answers

**Q: I have a black fuzzy stuff on my plants will it get rid of it**
A: We had the same problem with Black Beard Algae, which is one of the hardest to get rid of. Especially because algae eaters don't like this. Now we have only a few spots here and there occassionally, but they never get bigger than 1mm, previously they were up to 5cm in length and covered large areas. We have 3 very strong lamps illuminating too.

What I have learned:

1. Water balance - this is where this and other similar products can help. They need a rough substrate or large biological filter to work as well.

2. Healthy living plants - you need enough plants to remove all other food from the water. Give them enough micro-element fertilizers, so they have an upper hand against algae. Grow at least one fast growing variety, which you cut back weekly and remove all excess plant food with this.

3. Algae and waste eaters - against algae the best is to have one Common Bristlenose Catfish (Pleco) aka Ancistrus sp, which is the smallest this kind of fish. This doesn't like Black Beard, but don't avoid this either, if there is any kind of other edible material in it. For other algae and waste you can have Amano shrimps and/or Assassin snails. Assassins will get rid of small unwanted snails as well.

4. Hydrogen peroxide - if you have big bushes of Black Beard, very carefully use pipette underwater to put a drop of food grade H2O2 in the middle of the bush. This reacts with photosynthesising elements of the algae and kills this. Keep fish and other animals (incl snails) in the other end of the tank for a few minutes and dont use too much of it. For 200l tank I have used up to 5ml 10% of H2O2/hydrogen peroxide. It is important to keep lights on and fish as far as possible, as this may burn their gills. This would be good to switch filter off during the treatment, depending of your tank layout. Too much and direct peroxide can kill good bacteria too, if this happens, use this product (or similar product) to replenish the bacteria.

I hope this helps.

**Q: Does it treat brown algae as well ?**
A: Yes, we have no data to suggest that it doesn't

**Q: Every week my fish tank keeps going green where am i going wrong**
A: Do you clean the inside of the glass on the tank because the envii aquarium klear won't work on its own . I also recommend changing the filters once a month as directed by filter manufacturer . Hope this helps .

**Q: Is this safe to use for my yellow bellied slider terrapins??? It does say all types of aquatic s fine but i didnt want to assume**
A: I have shrimps so only used half of what it said. Tells you on the back instructions.  They are very delicate shrimps so I suppose it would be fine with yours.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fantastic product
*by K***R on 8 August 2024*

I have used many algae cleaning products for my tank that barely worked. So I saw this product and read the reviews was a little sceptical but purchased all the same. But wow I am amazed at how fast it worked I partially emptied my tank and added 7.5ml to refill water and wow was a little murky at first but now as you can see water is crystal clear and gravel is clean wow wow would highly recommend this product to anyone wanting fast acting aquarium cleaner pity can only give 5 +✨ ✨✨✨✨✨ great price, easy to use excellent performance

### ⭐⭐⭐⭐⭐ This Stuff Is Like 🎩🪄🔮
*by P***S on 17 June 2025*

Before choosing this product I had looked at plenty of others & thought they all say that they do this & do that. So I took a punt on this one, as they say the proof of the pudding etc (I do not recommend anybody trying to consume this product as it won't end well!)After a week, my aquarium always used to get a big build up of algae on the live plants, ornaments, air brick & filter as well as on the glass, which was due to its location & getting direct sunlight through 2 Velux windows (aquarium can't be moved elsewhere out of sunlight due to having limited space).I half emptied the aquarium l, cleaned plants etc but not the glass & refilled it & added 10ml as directed.After a week the results were astounding!! No return build up of algae on anything in the aquarium & after a 2 week of treatment, the algae has not returned! I thoroughly recommend this product!I am using 10ml weekly & it contains according to the labelling, natural ingredients that do not harm the fish, pondlife or plants.I'm so glad I took a punt as I was apprehensive that I would work & have found out it doe so amazingly well!

### ⭐⭐⭐⭐ Fish and plants happy.. but so is my algae
*by R***A on 23 December 2018*

I started using this product just over 20 days ago and there’s already a lot of improvement to my tank, obviously there are other factors affecting my improvements but this product really does help with my plant growth and fish health. You can see the pictures I attached, one of the tank 20 days ago and now, and the other photo is of my fish, he’s alive and good, very active, and also gaining colour (on his tail), he was completely clear on some parts of his tail previously. I am not sure if that’s just him maturing or this good bacteria helping him out as well. The only reason why I’m giving this 4 stars not 5, is because I originally bought it to help out with my algae issue, which hasn’t helped and it feels like my algae issue actually went worse...

## Frequently Bought Together

- envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres
- Envii Aquarium Chlorine Klear Tap Safe Water Treatment for Fish Tanks, Natural Water Conditioner & Dechlorinator, Chlorine Remover, Safe for All Fish & Aquatic Life, 250ml Treats 2,500L

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-22*