Pond Block

TetraPond Pond Block algae remover and water clarifier
Product No. 16735
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Removes pond algae for clean and clear pond water.

Pond Block® helps control algae growth in ornamental fish ponds. For containerized ponds and fountains only. Not recommended for use with live plants.

This product comes in the following sizes: 4 ct and 50 ct.
Pond Block is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Fountain Beautiful This will be my third order of these blocks. I have a 6 foot tall fountain that gurgles up, runs down the sides and is collected in the base to be drawn in and bubbled up again. One of these blocks in the base every 2 weeks keeps the water clear of green algae.
Date published: 2016-06-28
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Is it safe to use with plants and live fish

Asked by: boofsmith
Fish, yes, as long as they are goldfish or koi, plants, no. BREX
Answered by: BREX
Date published: 2017-11-06

I have an outdoor fountain, and the birds drink from it. Is it safe to use your product in my fountain?

Asked by: KathyJones
Thanks for asking, Kathy. No, you should not use this product in your fountain if birds drink from it.
Answered by: Tetra Expert
Date published: 2017-07-11

I have a 1000 gallon garden pond with a horsehair algae problem.How many blocks should I use at one time? I was also told that the alkaline level is critical to using copper sulfate. Is this so, and if so, what level of alkalinity is optimal?

Asked by: Joe t
You would need four blocks. This product is not safe for live plants, snails, tadpoles, frogs, in case you have any. You want your alkalinity in the moderate to hard range, not really soft. This block dissolves very slowly, over a period of approximately four weeks. If you want it to dissolve more quickly, place it in a waterfall type area where there is water movement. BREX
Answered by: BREX
Date published: 2017-06-30

Is pond block safe for birds

Asked by: Brummie
We have never tested this product on birds, but no, we would not recommend it. BREX
Answered by: BREX
Date published: 2017-06-01

Is pond block safe for pets in wading pools

Asked by: Monte
HI Monte, No, it is not safe in a wading pool with pets, unfortunately! BREX
Answered by: BREX
Date published: 2017-05-16

Is it safe for snails and shrimp?

Asked by: gokistler
Hello gokistler, No, this product is not safe for invertebrates in general, like most all other chemicals. BREX
Answered by: BREX
Date published: 2017-05-01

I do have live pond plants in my pond. If I take them out and throw in a block and wait a few days, will that still kill my plants??? Thanks Kathy

Asked by: Kathy32
Hi Kathy, Yes, it will. This product slowly disperses over 30 days. So it will not remove algae and just dissipate, unfortunately. You might want to try Barley and Peat Extract or Algae Control, depending on the age of the pond, the type of algae you are trying to remove and how filtered the pond is, etc. If green water is the concern, I highly recommend a UV light. It is more money up front, but it is safer, and saves money long term. BREX
Answered by: BREX
Date published: 2017-04-27

How often should I dose with pond block?

Asked by: Mrs L
Thank you for your interest in this Tetra product! You dose this once a month and the product very gradually dissipates throughout the water for 30 days. BREX
Answered by: BREX
Date published: 2016-12-30
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