What are the ingredients?

ACTIVE INGREDIENTS: Copper Sulfate pentahydrate 1.02%; 1-dimethylurea 0.51%OTHER INGREDIENTS: 98.47% NOTE: Ingredients taken from package label.

How long until you start to see the water clear up?

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.

Is the block supposed to disolve? its been in my pond for two weeks and still the same as when it went in.

No. That's why I like it. It gets smaller over time and takes about 3 - 4 weeks to disappear.

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.

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.

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Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count

Pond Block Controls Algae In Ornamental Fish Ponds, 4 Count

Product ID: 2284042

Details

Brand
Tetra
Item Form
Tablets
Item Weight
5.6 ounces
Liquid Volume
100 gallons
Number of Packs
4

🌿Safe for ornamental fish ponds only

💧Treats up to 250 gallons per block

🧊Slow-release 30-day dissolve

€ 23.53

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Description

🌊 Keep your pond pristine and your fish happy — algae doesn’t stand a chance!

TRUSTED LEGACY - Backed by 50 years of Tetra expertise, a brand synonymous with quality in fishkeeping.
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 fish safety without harming your aquatic friends.
SIMPLE CONSISTENT MAINTENANCE - Replace blocks only after full dissolution, making pond care hassle-free and reliable.
CRYSTAL CLEAR WATERS EFFORTLESSLY - Slow-release blocks dissolve over 30 days for continuous algae control.

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. Ideal for maintaining clear, beautiful water without harming fish, it’s not recommended for ponds with live plants. This 4-count pack offers a convenient, trusted method to keep your pond algae-free and visually stunning.

Specifications

Allergen Information	Gelatin Free
Asin	B0034CAYDO
Best Sellers Rank	#20,098 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #62 in Water Garden & Pond Treatment
Brand Name	Tetra
Customer Reviews	4.4 4.4 out of 5 stars (1,203) 4.4 out of 5 stars
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
Unit Count	1 Count
Upc	046798167358
Warranty Description	See label

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€ 23.53

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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