--- product_id: 315261645 title: "GRECH CBG-800 5W UV Sterilizer Hang-On Back Filter, 20-50 gallon/211 GPH, Black" brand: "sunsun" price: "£48.85" currency: GBP in_stock: true category: "Sun Sun" url: https://www.desertcart.co.uk/products/315261645-grech-cbg-800-5w-uv-sterilizer-hang-on-back-filter store_origin: GB region: United Kingdom --- # 211 GPH adjustable flow 5W UV sterilizer power Active carbon & bio media GRECH CBG-800 5W UV Sterilizer Hang-On Back Filter, 20-50 gallon/211 GPH, Black **Brand:** sunsun **Price:** £48.85 **Availability:** ✅ In Stock ## Summary > 🐠 Elevate your aquarium game with GRECH’s sleek, smart sterilizer! ## Quick Answers - **What is this?** GRECH CBG-800 5W UV Sterilizer Hang-On Back Filter, 20-50 gallon/211 GPH, Black by sunsun - **How much does it cost?** £48.85 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/315261645-grech-cbg-800-5w-uv-sterilizer-hang-on-back-filter) ## Best For - sunsun enthusiasts ## Why This Product - Trusted sunsun brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual Filtration Power:** Biological + mechanical filtration with included active carbon & bio media - • **Surface Skimmer Magic:** Eliminates surface films and oils for a flawless water surface - • **Tailored Flow Control:** Adjustable 211 GPH filter flow fits your aquarium’s unique needs - • **Effortless Hang-On Design:** Easy installation and quiet operation keeps your tank stress-free - • **Crystal Clear Water, Always:** 5W UV sterilizer zaps algae & bacteria for pristine tanks ## Overview The GRECH CBG-800 is a 5W UV sterilizer combined with a hang-on back filter designed for 20-50 gallon aquariums. It features an adjustable 211 GPH flow rate, a surface skimmer to remove surface films, and dual biological and mechanical filtration with included active carbon and bio media. Its quiet, easy-to-install design ensures crystal clear water by eliminating algae, bacteria, and free-floating parasites. ## Description The Grech CBG-Series Hang-On Back UV Filter comes with a diverse and unique design. While being suitable for freshwater and saltwater aquariums, its style is a “Hang-On Back,” making it convenient for daily use. The filter is beautifully crafted to allow a simple installation and quiet operation. Water flow can be control accord to your aquarium needs. The CBG-Series has a biological and mechanical filtration and comes with active carbon and bio media. The CBG-Series also features a 5W UV Sterilizer which can be turned on and off. The UV Sterilizer helps in eliminating algae, keeping aquarium water clear, and aids in the health of aquatic animals from free-floating parasites. The controllable surface skimmer can reduce surface oil from your aquarium tank. ## Features - Adjustable 211gph Filter Flow Rate with Surface Skimmer to eliminate undesired surface films - Features a 5W UV Sterilizer. Helps eliminate algae and bacteria, keeping aquarium water crystal clear - Suitable Aquarium Tank Size: 20 to 50 Gallons - Dimension: 9 x 5 x 7in (229 x 127.5 x 179mm) - Biological and mechanical filtration. Box includes active carbon and bio media.Note: Give the impeller flywheel" a little push to start as magnet sometime stuck to certain position when sitting in the box for a long period of time. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01LY3YMHG | | Allergen Information | Fish Free | | Batteries Included | No | | Best Sellers Rank | #34,855 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,998 in Aquarium Accessories | | Color | Black | | Customer Reviews | 4.1 4.1 out of 5 stars (525) | | Date First Available | 27 March 2017 | | Item Weight | 500 g | | Item model number | CBG-800 | | Number of Items | 1 | | Pet Life Stage | All Life Stages | | Product Dimensions | 24.13 x 17.27 x 19.05 cm; 500 g | | Quantity | 1 | | Size | 20-50 gallon/211 GPH | | batteries required | No | ## Images ![GRECH CBG-800 5W UV Sterilizer Hang-On Back Filter, 20-50 gallon/211 GPH, Black - Image 1](https://m.media-amazon.com/images/I/612Xq+O6KoL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Will 2 of these would work for a 75 gallon tank. The reviews so far look good on this item.** A: I use one in a 55 gal. tank, so two should be plenty for a 75 gal. **Q: Can this replace a protein skimmer as well? right now i have a hang on filter & hang on skimmer, as well as a uv. i'm looking to combine them** A: It does have a surface skimmer built in the only issue can be fish fry. You can always put a sponge over it, but most of the time I see my fry stay away from it. Depends on the size of your tank. I would say this filter is good up to 40 gallons by itself. **Q: The impeller is working, so why is my filter only shooting out a small amout of water every 30 seconds?** A: Take the filter out and pull open the power block, pull the impeller, make sure there's no gunk in there and make sure the impeller is inserted all the way. Had this happen with one of mine - this fixed it. **Q: Having issues with it fitting a 60 gallon it won’t fit over the lip. I don’t want to force it to break the plastic. Has anyone else had this issue?** A: I had the same problem. I ended up needing to use a small hacksaw and cut a groove in the plastic border of my tank. Hope you do better with your filter than I've done with mine. FWIW, I don't think this filter will handle a 60 gallon tank. I have a rough time with mine just handling a less than 40 gallon tank. ## Frequently Bought Together - Grech CBG-800 5W UV Sterilizer Hang-On Back Filter, 20-50 gallon/211 GPH, Black - AquaClear 50 Foam Filter Inserts, Aquarium Filter Replacement Media, 3 Count (Pack of 1), A1394 - Aqua Clear AquaClear Activated Carbon Filter Inserts, 3 Pack – Replacement Chemical Filter Media for 50 Gallon Tank --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/315261645-grech-cbg-800-5w-uv-sterilizer-hang-on-back-filter](https://www.desertcart.co.uk/products/315261645-grech-cbg-800-5w-uv-sterilizer-hang-on-back-filter) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-25*