--- product_id: 2284042 title: "Tetra Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count | Clears Cloudy Water & Prevents Algae In Ornamental Ponds & Fountains, Slow-Release Blocks Dissolve Over 30 Days" brand: "tetra" price: "2794 kr" currency: ISK in_stock: true category: "Tetra" url: https://www.desertcart.is/products/2284042-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-4 store_origin: IS region: Iceland --- # Safe for ornamental fish ponds only Treats up to 250 gallons each 4 slow-dissolving blocks Tetra Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count | Clears Cloudy Water & Prevents Algae In Ornamental Ponds & Fountains, Slow-Release Blocks Dissolve Over 30 Days **Brand:** tetra **Price:** 2794 kr **Availability:** ✅ In Stock ## Summary > 🌊 Keep your pond flawless, the Tetra way! ## Quick Answers - **What is this?** Tetra Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count | Clears Cloudy Water & Prevents Algae In Ornamental Ponds & Fountains, Slow-Release Blocks Dissolve Over 30 Days by tetra - **How much does it cost?** 2794 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/2284042-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-4) ## 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 - • **FOMO-Free Pond Perfection:** Keep your pond envy-worthy and algae-free—because your outdoor sanctuary deserves the best. - • **Trusted Legacy, Proven Results:** Backed by Tetra’s 50 years of aquatic expertise and a 4.3-star rating from over 1,200 enthusiasts. - • **Generous Coverage, Minimal Effort:** One block treats up to 250 gallons, making maintenance simple and cost-effective for medium-sized ponds. - • **Optimized for Ornamental Elegance:** Specifically formulated for ornamental fish ponds, ensuring your aquatic oasis stays pristine and vibrant. - • **Crystal Clear Waters, Effortlessly:** Each block dissolves over 30 days, providing continuous algae control without daily hassle. ## Overview Tetra Pond Block is a trusted algae control solution designed for ornamental fish ponds. Each of the 4 blocks treats up to 250 gallons of water, dissolving slowly over approximately 30 days to maintain clear, algae-free water. Not suitable for ponds with live plants, this product is ideal for containerized ponds and fountains, backed by Tetra’s 50-year legacy in aquatic care. ## Description For 50 year, fishkeeping enthusiasts have looked to the Tetra name 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. Algae growth can quickly take over a pond and cloud your water. Conquer algae growth with TetraPond products so you can keep a beautiful oasis. TetraPond Pond Block removes pond algae for clean and clear pond water. Pond Block helps control algae growth in ornamental fish ponds. Use one block for water volumes between 100 and 250 gallons. Replace block when the previous block has fully dissolved for regular maintenance. Dissolving usually takes about 30 days. This pack contains 4 blocks. TetraPond Pond Block is for containerized ponds and fountains only. Not recommended for use with live plants. ## Features - Helps control algae growth in ornamental fish ponds - Not recommended for use in ponds with live plants - Each block treats 250 gallons - Carefully follow dosage instructions - Not for use in non-ornamental ponds ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0034CAYDO | | Allergen Information | Gelatin Free | | Best Sellers Rank | #19,955 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #69 in Water Garden & Pond Treatment | | Brand Name | Tetra | | Customer Reviews | 4.3 4.3 out of 5 stars (1,200) | | Global Trade Identification Number | 00046798167358 | | Included Components | 1 x Controls Algae Growth In Ornamental Fish Ponds | | Item Form | Tablets | | Item Type Name | Tetra Pond Block 4 Count, Controls Algae Growth In Ornamental Fish Ponds | | Item Weight | 5.6 ounces | | Liquid Volume | 100 gallons | | Manufacturer | Tetra | | Manufacturer Part Number | 16735 | | Model Number | 16735 | | Number of Items | 1 | | Number of Packs | 4 | | Pet Type | Fish | | Target Species | Fish | | UPC | 046798167358 | | Unit Count | 1 Count | | Warranty Description | See label | ## Product Details - **Brand:** Tetra - **Item Form:** Tablets - **Item Weight:** 5.6 ounces - **Liquid Volume:** 100 gallons - **Number of Packs:** 4 ## Images ![Tetra Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count | Clears Cloudy Water & Prevents Algae In Ornamental Ponds & Fountains, Slow-Release Blocks Dissolve Over 30 Days - Image 1](https://m.media-amazon.com/images/I/7183XbaKpgL.jpg) ## Available Options This product comes in different **Item Package Quantity** options. ## Questions & Answers **Q: What are the ingredients?** A: ACTIVE INGREDIENTS: Copper Sulfate pentahydrate 1.02%; 1-dimethylurea 0.51%OTHER INGREDIENTS: 98.47% NOTE: Ingredients taken from package label. **Q: How long until you start to see the water clear up?** A: The length of time it takes to clear up the algae will depend on a number of things such as the overall water quality of the pond, the stocking level, your filtration, the amount of organic matter in the pond, and so forth. The more organic matter, the softer the water, the less effective and more time it will take. In a situation such as this, we recommend a partial water change initially, prior to dropping the blocks in. For more assistance, please contact the Tetra Consumer Relations Team at 1-800-526-0650. **Q: Is the block supposed to disolve? its been in my pond for two weeks and still the same as when it went in.** A: No. That's why I like it. It gets smaller over time and takes about 3 - 4 weeks to disappear. **Q: will the Tetra Pond Anti Algae Block work in a 40 gallon aquarium that has 2 turtles that are 30 years old. Will it harm them.** A: I use it in my goldfish pond. And my box turtles have access to it. No harm has come to either animal as long as the water is aerated. This product removes the oxygen from the water. ## Frequently Bought Together - Tetra Pond Block 4 Count, Controls Algae Growth In Ornamental Fish Ponds (16735) - Summit Clear-Water Barley Straw Pond Treatment, 2-Pack, Treats upto 2000 Gallons, 1000 Gallons per Bale - API POND ALGAEFIX Algae Control 32-Ounce Bottle, FISHAQUARI (169G) --- ## 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.is/products/2284042-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-4](https://www.desertcart.is/products/2284042-tetra-pond-block-controls-algae-in-ornamental-fish-ponds-4) --- *Product available on Desertcart Iceland* *Store origin: IS* *Last updated: 2026-09-17*