--- product_id: 19629336 title: "Tetra Pond Block Controls Algae in Ornamental Fish Ponds, 6 Count" brand: "tetra" price: "$28.70" currency: USD in_stock: true url: https://www.desertcart.us/products/19629336-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-6 store_origin: US region: United States of America --- # 10-day slow dissolve Treats up to 280 gallons Effective algae control Tetra Pond Block Controls Algae in Ornamental Fish Ponds, 6 Count **Brand:** tetra **Price:** $28.70 **Availability:** ✅ In Stock ## Summary > 💧 Keep your pond flawless and algae-free — because your oasis deserves the best! ## Quick Answers - **What is this?** Tetra Pond Block Controls Algae in Ornamental Fish Ponds, 6 Count by tetra - **How much does it cost?** $28.70 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/19629336-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-6) ## Best For - tetra enthusiasts ## Why This Product - Trusted tetra brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted Since 1951:** Backed by decades of expertise from Tetra, the leader in aquatic care solutions. - • **Crystal Clear Water:** Effectively clears algae blooms to keep your ornamental pond pristine and vibrant. - • **Effortless Maintenance:** Simple, no-fuss application keeps your water feature looking flawless with minimal effort. - • **Broad Coverage Capacity:** One block treats between 30 and 280 gallons, perfect for various fountain sizes. - • **Long-Lasting Algae Defense:** Slow-release blocks dissolve over 10 days for continuous protection. ## Overview Tetra Pond Fountain Block is a slow-dissolving algae control tablet designed for ornamental fountains and containerized ponds. Each block treats up to 280 gallons of water, dissolving over approximately 10 days to prevent and clear algae blooms, ensuring crystal-clear water and a healthy aquatic environment. Ideal for pond owners seeking easy, effective maintenance without harming fish. ## Description TetraPond® Fountain Block® helps to clear cloudy water and control algae growth in ornamental fish ponds. These blocks are ideal for containerized ponds and fountains – not recommended for use with live plants. Use one TetraPond Fountain Block for water volumes between 100 gallons (380 L) and 250 gallons (950 L). For the initial dose, add one block for each 100 gallons (380 L) of pond/fountain water. For regular maintenance, replace block(s) after previous block(s) have fully dissolved, usually after 30 days. Algae are primitive plants that, via photosynthesis, combine water and carbon dioxide to form sugars for energy and growth. Algae can obscure colorful fish and deplete valuable oxygen. No pond is ever totally free of algae, but in a balanced environment and with the right treatment methods, algae can be kept in check. Since 1951, Tetra has developed the world’s most comprehensive body of fish food knowledge, and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need – from a large variety of quality fish food and innovative equipment to test kits and decor. ## Features - CONTROLS ALGAE: Helps prevent algae growth in ornamental water fountains and ponds. - SLOW RELEASE: Blocks fully dissolve slowly after about 10 days. - FOR CONTAINERIZED FOUNTAINS & PONDS: Not recommended for containers with live plants. - EASY TO USE: One block treats between 30 and 280 gallons of water. - CLEARS ALGAE BLOOMS: Each block dissolves to control algae and clear algae blooms. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003DASH9U | | ASIN | B003DASH9U | | Allergen Information | Gelatin Free | | Best Sellers Rank | #44,329 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #133 in Water Garden & Pond Treatment | | Brand Name | Tetra | | Customer Reviews | 4.2 4.2 out of 5 stars (1,603) | | Date First Available | March 20, 2010 | | Department | Unisex-Adult | | Global Trade Identification Number | 00046798167372 | | Included Components | TetraPond Anti-Algae Blocks for Fountains, 6-Count | | Item Form | Tablets | | Item Type Name | Tetra Fountain Block 6 Count, Controls Algae Growth In Ornamental Fountains | | Item Weight | 0.27 g | | Item model number | 16737 | | Liquid Volume | 10 ml | | Manufacturer | Tetra | | Manufacturer | Tetra | | Manufacturer Part Number | 16737 | | Model Number | 16737 | | Number of Items | 1 | | Pet Type | Fish | | Product Dimensions | 3.63 x 1.63 x 5.5 inches; 0.01 ounces | | Target Species | Fish | | UPC | 707005178078 046798167372 | | Unit Count | 2.88 Ounce | | Warranty Description | See label | ## Product Details - **Brand:** Tetra - **Item Form:** Tablets - **Item Weight:** 0.27 g - **Liquid Volume:** 10 ml - **Unit Count:** 2.88 Ounce ## Images ![Tetra Pond Block Controls Algae in Ornamental Fish Ponds, 6 Count - Image 1](https://m.media-amazon.com/images/I/81oYdPeS4LL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Do you have to clean out the algae before using this product?** A: Thank you for your question, Donna! We do recommend cleaning it out, if possible, as this product is more of a preventative product. It doesn't work as well at killing algae that is present as it does at preventing it from occurring. Customers rave about this product when put in prior to algae growth. So if you clean out your fountain first, then refill it and drop this in, you should not have algae the rest of the season. **Q: I have a lot of birds drinking from my fountain now, are the Flountain blocks safe for wildlife?** A: Customer feedback over the years has indicated that these are safe for birds. However, we want you to be aware that we have not tested them specifically for this purpose, and cannot guarantee the safety of the birds. They do dissolve slowly, and are very diluted in the fountain. **Q: will this item harm birds drinking from the fountain?** A: Birds did drink from fountain but have no way of knowing if it harmed them. Does say not to use with plants and may be toxic to fish. Was getting lots of green algae. Started using PHYSAN 20. Just a few drops each week. Water is so clear and haven't had any algae. Water will foam up when more water is added but doesn't last. Always have a block in the fountain as a back up **Q: Do you place the block on the fountain "floor" or do you need to place it in a floating container?** A: Thank you for your question. The Tetra Pond Fountain Block is typically placed at the bottom of a fountain reservoir where it can gradually dissolve to control algae growth. If you have additional questions you can call Pond and Garden Depot toll free at 1-866-305-5459. Sincerely, Keith H. Customer Service ## Frequently Bought Together - Tetra Pond Fountain Block 6 Count, Controls Algae Growth In Ornamental Fountains - EasyCare FounTec Algaecide and Clarifier, 8 oz. Bottle - Fountain Algaecide and Clarifier - 8oz - Kills and Inhibits All Types of Algae Growth, Formulated for Small Ponds and Water Features, Treats up to 8,000 Gallons --- ## 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.us/products/19629336-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-6](https://www.desertcart.us/products/19629336-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-6) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-23*