Tetra Algae Control Pond Block Water Treatment, 50 count

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$63.64 Chewy Price
($1.28 /ea)
Save $65.15 (-51%)
$128.79 List Price
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About This Item

Details

  • For containerized ponds only
  • Limited to use for backyard or homeowner ponds and water fountains
  • EPA approved
  • Not for use with live plants
  • Safe for fish but not for use in non-ornamental ponds

Instructions

Learn More About Tetra From Our Team of Experts

Frequently bought together

Questions & Answers

7 Customer Questions

Is this product safe for dogs? My dogs drink from the pond

Answer by Chewy • Sep 11, 2019
This product has not been tested on dogs but it's recommended that it's diluted into the pond first. Please allow the product to mix within the pond for a few hours prior to allowing the dog near the pond area again

Is this item okay for ducks? How long does it last?

Answer by Chewy • Oct 15, 2022
Tetra has not researched this product's use with ducks and does not recommend it. It is intended for water gardens and fish ponds only. This block dissolves very slowly, over a period of approximately four weeks (30 days).

I have a 35-40 gal ornamental fountain. These say use in 100-250gal. But I see some reviews that say they are used in smaller fountains. Can I break them in half and use them? Or would full strength be ok?

Answer by Chewy • Nov 05, 2019
Although the blocks can be cut, the "Tetra Algae Control Pond Fountain Block Water Treatment" is the same formula, but in smaller blocks, which may be more convenient for smaller fountains.

Can this be used in a turtle pond?

Answer by Chewy • Mar 09, 2024
This water treatment has not been tested for the use of turtles.
Reviews
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4.5
Rated 4.5 out of 5 stars
86 Ratings
Terms & Conditions

36 Customer Reviews

Rated 5 out of 5 stars
By Jean on Oct 3, 2025

Delivery!

Glad we could get that quanity for the price. Great value

Glad we could get that quanity for the price. Great value

Rated 5 out of 5 stars
By Steven on Oct 3, 2025

It works!

Very effective product

Very effective product

Rated 5 out of 5 stars
By Gary on Apr 15, 2025

Pond Blocks available at Chewy

I was pleasantly surprised that Chewy offers pond blocks, and for a very competitive price.

I was pleasantly surprised that Chewy offers pond blocks, and for a very competitive price.

Rated 5 out of 5 stars
By Diane on Jun 9, 2025

Clear pond water

Keeps our pond water crystal clear!

Keeps our pond water crystal clear!

Rated 5 out of 5 stars
By Charles on Aug 16, 2024

Algae control

These Tetra Algae Control blocks work very well for small ponds and waterfalls. I have been using them for years and will continue. Chewy's has a decent price

These Tetra Algae Control blocks work very well for small ponds and waterfalls. I have been using them for years and will continue. Chewy's has a decent price and fast shipping, so here is where I will keep buying them.

Rated 5 out of 5 stars
By Diane on Feb 23, 2025

On time

They love it

They love it

Rated 1 out of 5 stars
By Avi on Apr 26, 2024

Couldn’t receive my package

I could not receive it because FedEx delivered to different address and it was stolen from there

I could not receive it because FedEx delivered to different address and it was stolen from there

Rated 5 out of 5 stars
By Dan on Jun 7, 2024

Phone Order for bond block

The representative was extremely helpful and and understanding.

The representative was extremely helpful and and understanding.

Rated 5 out of 5 stars
By Katie on Feb 21, 2024

Clear pond

Love this product! Keeps the pond clear and the fish love it. I don’t have to worry now about chemicals that will kill my fish.

Love this product! Keeps the pond clear and the fish love it. I don’t have to worry now about chemicals that will kill my fish.

Rated 1 out of 5 stars
By Judy on Nov 12, 2023

Very Confusing

The label states "This pesticide is toxic to fish and aquatic invertebrates and may contaminate water through runoff." Why wasn't this in the description? I don't

The label states "This pesticide is toxic to fish and aquatic invertebrates and may contaminate water through runoff." Why wasn't this in the description? I don't know what they keep in ponds, but I'm returning it!