--- product_id: 48226688 title: "Cycle Water Treatment, 500 ml" brand: "fluval" price: "€ 42.82" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.at/products/48226688-cycle-water-treatment-500-ml store_origin: AT region: Austria --- # Rapid ammonia & nitrite neutralization Long-term water health support Instant beneficial bacteria boost Cycle Water Treatment, 500 ml **Brand:** fluval **Price:** € 42.82 **Availability:** βœ… In Stock ## Summary > 🦠 Transform your tank into a thriving aquatic paradise from day one! ## Quick Answers - **What is this?** Cycle Water Treatment, 500 ml by fluval - **How much does it cost?** € 42.82 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/48226688-cycle-water-treatment-500-ml) ## Best For - fluval enthusiasts ## Why This Product - Trusted fluval brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Fast-Track Toxicity Control:** Micro-organisms quickly metabolize harmful ammonia and nitrite, preventing dangerous spikes. - β€’ **Trusted by Thousands of Aquarists:** Highly rated with 4.6 stars and thousands of positive reviews for consistent aquarium health. - β€’ **Jumpstart Your Aquarium's Ecosystem:** Immediate inoculation with powerful beneficial bacteria ensures a safe habitat from day one. - β€’ **Safe for Immediate Fish Introduction:** Establishes a robust bacterial colony that allows you to add fish right away without risk. - β€’ **Build a Resilient Biological Foundation:** Regular use excludes harmful bacteria, promoting stable water quality over time. ## Overview Fluval Cycle Water Treatment is a 500 ml liquid formula designed to rapidly establish beneficial bacteria in new and existing aquariums. It metabolizes toxic ammonia and nitrite, creating a safe, stable environment that supports immediate fish introduction and long-term water quality. Trusted by thousands, it’s a must-have for any serious aquarist aiming for a healthy, vibrant tank. ## Description The Fluval biological water conditioner is a reactive, biological aquarium additive that ensures that all aquariums are immediately added with a strong beneficial bacterial team. This creates a safe, biological habitat for your fish. These extremely effective microorganisms create a biological flora in which dangerous ammonia and nitrite are rapidly converted so that fish can be immediately inserted into the aquarium. ## Features - Fluval Biological Enhancer provides immediate inoculation with a powerful team of beneficial bacteria, creating a safe and stable biologial habitat for your fish from day one - Highly effective micro-organisms quickly metabolise harmful ammonia and nitrite, helping prevent toxic spikes and supporting a healthier enivornment - Recommended to aquarium set ups, as it helps to establish essential biological flora right from the beginning - Regular application of the Biological Enhancher helps to exclude the establishment of harmful or undesirable bacteria, promoting water health and quality long-term - Using the water treatment builds up a robust foundation against bacteria, therefore enabling a safe environment for immediate addition of fish to your tank ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00G25IAN6 | | Best Sellers Rank | 803 in Pet Supplies (See Top 100 in Pet Supplies) 3 in Aquarium Water Treatments | | Brand Name | Fluval | | Country Of Origin | United Kingdom | | Customer Reviews | 4.6 4.6 out of 5 stars (6,834) 4.6 out of 5 stars | | Global Trade Identification Number | 00015561183512 | | Item Form | Liquid | | Item Type Name | Cycle Biological Aquarium water treatment | | Item Weight | 0.56 Kilograms | | Liquid Volume | 16.9 Fluid Ounces | | Manufacturer | Rolf C Hagen UK Ltd | | Manufacturer Part Number | A8351A1 | | Model Number | A8351A1 | | Number Of Items | 1 | | Number Of Packs | 1 | | Pet Type | Fish | | Target Species | Fish | | Unit Count | 1 count | | Upc | 015561109703 015561183512 | ## Product Details - **Brand:** Fluval - **Item form:** Liquid - **Item weight:** 0.56 Kilograms - **Liquid volume:** 16.9 Fluid Ounces - **Number of Packs:** 1 ## Images ![Cycle Water Treatment, 500 ml - Image 1](https://m.media-amazon.com/images/I/71qzj+FGElL.jpg) ## Available Options This product comes in different **Size Name, Style Name** options. ## Questions & Answers **Q: i have a 240l tank how much cycle do i use in my tank it is a new tank.** A: Tip the whole bottle in your filter **Q: Can this be used to boost some established bio media in a new tank?** A: Yes definately. Put it in the tank as instructions say. Then keep putting a min og 10 ml in until your happy. I used it for setting up new 200 ltr tank and it's the only stuff I used after that. **Q: Can I use this in salt water?** A: Having read the information on the back of the bottle it says that it is safe for use in fresh and salt water aquariums. **Q: I want to add new fish into my established tank. Can I add this into the tank, let the bag with new fish float for a while then release the fish?** A: No! What you must do is add this after following the instructions and leave for a few days for the bacteria to establish a proper environment for the fish before they are added. Try reading a book or 3 on setting up a fish tank. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Does the job *by on Reviewed in the United Kingdom 17 August 2026* As described ### ⭐⭐⭐⭐⭐ Nothing but I like the product thanks ny the way❀️ *by on Reviewed in the United Kingdom 16 October 2026* Great and thanks ### ⭐⭐⭐⭐⭐ Maintain a healthy Aquarium *by on Reviewed in the United Kingdom 3 April 2021* I use this product when setting up a new aquarium (as part of the nitrogen cycle to promote healthy ammonia eating bacteria growth, a 6 to 8 week process) and as part of my weekly water changes. I feel that this product works very well, as my fish are all happy and healthy and I have never experienced any bad water quality issues (ammonia spikes etc).I use this weekly to add to my 200ltr, 60ltr and 30ltr aquariums when I do a water change. I change 20% - 30% of the water volume and add an appropriate dose of this stuff, however it's not really possible to overdose so it does not really matter if you add a little bit extra. I usually do add a bit more than stated on the label. I keep it stored at room temperature and the 2ltr bottle usually lasts me about 6 weeks.There is always a seal covering the opening after the lid has been unscrewed, so you know it is brand new and has not been opened / tampered with. This is safe for my fresh water aquarium inhabitants, of which I have many varieties.Pros:- The larger 2ltr bottle is excellent value compared to the 250ml or 500ml bottles- Quick delivery / repeat orders available- Far cheaper than my local pet storeCons:- Nothing I can think of reallyI hope this review has been helpful to you.Happy Fish Keeping! ## Frequently Bought Together - Fluval Cycle Biological Enhancer, Aquarium Water Treatment, 16.9 Oz., A8351 - Fluval Waste Control Biological Cleaner, Aquarium Water Treatment, 8.4 Oz., A8355 - Fluval AquaPlus Water Conditioner, Aquarium Water Treatment, 16.9 Oz., A8344 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/48226688-cycle-water-treatment-500-ml](https://www.desertcart.at/products/48226688-cycle-water-treatment-500-ml) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-10-28*