---
product_id: 2284042
title: "Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count"
brand: "tetra"
price: "COP 78447"
currency: COP
in_stock: true
reviews_count: 9
category: "Tetra"
url: https://www.desertcart.co/products/2284042-pond-block-controls-algae-in-ornamental-fish-ponds-4-count
store_origin: CO
region: Colombia
---

# Safe for ornamental ponds (no live plants) Treats up to 250 gallons per block Slow-release 30-day dissolve Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count

**Brand:** tetra
**Price:** COP 78447
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your pond pristine and your fish visible—because your oasis deserves the best!

## Quick Answers

- **What is this?** Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count by tetra
- **How much does it cost?** COP 78447 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/2284042-pond-block-controls-algae-in-ornamental-fish-ponds-4-count)

## 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

- • **Powerful Coverage:** Each block treats up to 250 gallons, perfect for medium-sized ornamental ponds.
- • **Tailored for Your Oasis:** Formulated specifically for ornamental fish ponds, ensuring a safe environment for your aquatic friends.
- • **Simple & Effective Maintenance:** Replace blocks only after full dissolution—easy monthly upkeep without guesswork.
- • **Trusted Legacy, Proven Results:** From Tetra, a 50-year leader in fish care, backed by thousands of satisfied pond enthusiasts.
- • **Crystal Clear Waters, Effortlessly:** Slow-release blocks dissolve over 30 days for continuous algae control.

## Overview

Tetra Pond Block is a slow-release algae control solution designed for ornamental fish ponds, with each block treating up to 250 gallons over approximately 30 days. Not suitable for ponds with live plants, it offers an easy, effective way to maintain clear water and a healthy aquatic environment, trusted by fishkeeping enthusiasts for over 50 years.

## 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.

Review: Does a good job - I’ve ordered these for years and they always clear the algae quick in my koi pond.
Review: Works Extremely Well. More Than Satisfied. Great Price - Worked Extremely Well. Used 2 of the 4 blocks to start. Took about 10 day to really see any results and then added the other 2 blocks and water seem to get clearer as time went by. Still had some algae lingering but I don't have a very big filter. Can actually see my fish now....and some of the bottom. Signed up for a monthly subscription. Again EXTREMELY SATISFIED with this product. VERY REASONABLY PRICE and EASY TO USE.

## 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 | #20,273 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #60 in Water Garden & Pond Treatment |
| Brand | Tetra |
| Brand Name | Tetra |
| Customer Reviews | 4.4 out of 5 stars 1,203 Reviews |
| Global Trade Identification Number | 00046798167358 |
| Included Components | 1 x Controls Algae Growth In Ornamental Fish Ponds |
| Item Form | Tablets |
| Item Highlight | Clears Cloudy Water & Prevents Algae In Ornamental Ponds & Fountains, Slow-Release Blocks Dissolve Over 30 Days |
| 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

![Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count - 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does a good job
*by K***E on September 5, 2026*

I’ve ordered these for years and they always clear the algae quick in my koi pond.

### ⭐⭐⭐⭐⭐ Works Extremely Well. More Than Satisfied. Great Price
*by K***N on October 7, 2025*

Worked Extremely Well. Used 2 of the 4 blocks to start. Took about 10 day to really see any results and then added the other 2 blocks and water seem to get clearer as time went by. Still had some algae lingering but I don't have a very big filter. Can actually see my fish now....and some of the bottom. Signed up for a monthly subscription. Again EXTREMELY SATISFIED with this product. VERY REASONABLY PRICE and EASY TO USE.

### ⭐⭐⭐⭐⭐ Great project for keeping fountains clear.
*by D***J on June 20, 2026*

Keeps my 5 garden fountains algae free.

## 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)

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*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-10-01*