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Most Recent Questions
Recent Question:
Do I need to change the aquarium water every time?/How long does it take to treat ick?
Recent Question:
Does it work on a goldfish aquarium?
Recent Question:
We use water from our pond to water a vegetable garden. If we use this clarifier, would it add chemicals to the water that could be harmful to us?
Recent Question:
Does the Tetra Pond Water Clarifier "age out" or go bad, and could it then cause problems when used?
Questions with Most Recent Answers
Question:
Do I need to change the aquarium water every time?/How long does it take to treat ick?
Question:
Does it work on a goldfish aquarium?
Question:
We use water from our pond to water a vegetable garden. If we use this clarifier, would it add chemicals to the water that could be harmful to us?
Question:
Does the Tetra Pond Water Clarifier "age out" or go bad, and could it then cause problems when used?

Customer Questions & Answers for
Pond Block

Pond Block helps clear cloudy water and remove algae from ornamental ponds or fountain water. Pond Block is limited for use in backyard/homeowner ponds and water fountains. For containerized ponds only. Not recommended for use with live plants. EPA registered.
Customer Questions & Answers:
11 Questions
 | 
11 Answers
Overall Rating:
5 out of 5
5
out of
5
(1 Review)1

Questions & Answers for Tetra Pond Block

Question

Safe for animals

Is this product safe for animals to drink the water? I have a small 5 gal. pond/fountain. How much of a block would I use since it is so small?
Size of tank: Less than 10 gallons
asked 2 years, 3 months ago
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Terri
Calif.
on Pond Block
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0out of 0found this question helpful.
1 answer
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answer 1
Yes. We would recommend our fountain sized version of this product. 1/8 of that block would suffice. This particular block is so concentrated, we cannot break it down to such a small amount.

BREX
answered 2 years, 3 months ago
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by
BREX
+1point
1out of 1found this answer helpful.
Question

How long does it take for tetra pond block to dissolve?

We got some tetra pond block a Lowe's. It hasn't dissolved after a week in the pond. We tried it in a bucket of warmer water inside. It does not dissolve.
How long have you owned an aquarium? 3+ years
Type of tank: Goldfish
Size of tank: 21 to 50 gallons
asked 2 years, 7 months ago
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by
Janeskid
Nevada
on Pond Block
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0out of 0found this question helpful.
1 answer
Answers
answer 1
Hello,

Tetra Pond Block gradually dissolves over a period of 30 days. You replace it once a month. At this time of year, if it is cold where you are, it may take a little longer, but 30 days is average.

Regards,
BREX
answered 2 years, 7 months ago
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by
BREX
0points
0out of 0found this answer helpful.
Question

SHOULD I BE USING TETRA POND BLOCK OR TETRA FOUNTAIN BLOCK FOR A 6' X 6' X 1' POND WITH A LINER AND CIRCULATING PUMP ?

disregard reference to aquarium
How long have you owned an aquarium? 3+ years
asked 1 year, 4 months ago
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by
BLOOBS
Easton, PA, USA
on Pond Block
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0out of 0found this question helpful.
1 answer
Answers
answer 1
According to your dimensions stated, your pond holds approximately 270 gallons. Because of this size, we recommend using Pond Block as each block treats 250 gallons of water. Fountain Blocks each treat 80 gallons.

Kind Regards,
Tetra2
answered 1 year, 4 months ago
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by
BREX
0points
0out of 0found this answer helpful.
Question

if the pond block desolves in 30 days, will it be safe for a dog to drink from the fountain after this period?

asked 1 year, 4 months ago
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scoop
Seattle, WA, USA
on Pond Block
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Answers
answer 1
Yes, it would be fine, but you usually put a new one into the pond every 30 days to keep the algae from growing, throughout the entire summer. It is always best to just keep dogs and cats from ponds, in general, as they can pick up various protozoa as well, which can cause diarrhea.

BREX
answered 1 year, 4 months ago
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BREX
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Question

Will this product hurt wild birds when in my pond and waterfall?

How long have you owned an aquarium? 3+ years
Size of tank: Larger than 50 gallons
asked 1 year, 3 months ago
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by
columbine
Salt Lake City
on Pond Block
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0out of 0found this question helpful.
1 answer
Answers
answer 1
We recommend you ward off consumption of pond water for 12-24 hours after this product is initially introduced to your pond.

Tetra2
answered 1 year, 3 months ago
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by
BREX
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Question

Do Pond Blocks harm fish?

Pond Block's label says it is for "ornamental fish pond" with a picture of gold fish pond. But in the "Caution" section, it says it is a herbicide that kills fish and plants. It is confusing. Is Pond Block OK for a fish pond?
asked 1 year, 3 months ago
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by
Kent
on Pond Block
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0out of 0found this question helpful.
1 answer
Answers
answer 1
Yes it is, as it very slowly releases its ingredients into the pond over a 30 day period. You would have to use a much higher dose than what we recommend, to affect the fish.

BREX
answered 1 year, 3 months ago
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BREX
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Question

Will Pond Block change the PH in water?

How long have you owned an aquarium? 3+ years
Type of tank: Tropical
Size of tank: Larger than 50 gallons
asked 6 months ago
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by
Wailoky
Diamond Bar
on Pond Block
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0out of 0found this question helpful.
1 answer
Answers
answer 1
No, because it is slowly released over a period of four weeks, it will not affect your pH.

BREX
answered 6 months ago
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BREX
+1point
1out of 1found this answer helpful.
Question

Can I use Pond Block in a large fountain/pond as an alternative to Bromine or Chlorine?

I am servicing a large multi level pond that is about 60,000 gallons with a sand filtration system.
How long have you owned an aquarium? 6-12 months
Size of tank: Larger than 50 gallons
asked 5 months, 3 weeks ago
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Jasoninventura
Ventura, CA, USA
on Pond Block
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1 answer
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answer 1
Wow, that would take a lot of blocks! It is a chemical that slowly dissipates into the water over a month's time, depending on the water's chemistry. It is safe for fish, but not plants or crustaceans, molluscs, etc. It is recommended for concrete or rubberized liners, so I guess it would depend on what your fountain is made out of and whether it houses plants, etc, or not.

BREX
answered 5 months, 3 weeks ago
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BREX
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Question

Fountain

Does pond block harm birds or animals who drink out of fountains
asked 5 months, 3 weeks ago
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jimhaun
on Pond Block
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Answers
answer 1
No, it slowly dissipates and mixes with the water. It will not harm them.

BREX
answered 5 months, 2 weeks ago
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BREX
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Question

Will it harm dogs that drink out of the pond as I have 2 lg dogs that think its a water bowl ?

How long have you owned an aquarium? 3+ years
Type of tank: Goldfish
Size of tank: Larger than 50 gallons
asked 5 months, 1 week ago
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chattycathy
warren country nj
on Pond Block
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1 answer
Answers
answer 1
No, it slowly dissipates into the water over a period of a month, and is always fully diluted.

BREX
answered 5 months, 1 week ago
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BREX
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Question

will this product hurt koi fish or frogs?

i have a 6x9 pond
How long have you owned an aquarium? 3+ years
asked 4 months, 3 weeks ago
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karen2kat
Wilmington, NC, USA
on Pond Block
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answer 1
It is fine for koi, but not safe for frogs as they aborb chemicals through their skin.

BREX
answered 4 months, 3 weeks ago
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BREX
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