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EcoBio-Block Stone for Aquariums, Medium - Natural Water Clarifier and Odor Remover, Treats 15 to 40 Gallons

4.1 4.1 out of 5 stars 2,530 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Aquarium Water Treatments by EcoBio-Block
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Purchase options and add-ons

  • Volcanic rock containing beneficial bacteria colonies, disperse about every 30 minutes. Clarifies cloudy water and eliminates odors
  • Speeds up nitrogen cycle, with 100% pure bacteria in spores which germinate in early, middle and late stages, only germinating in the presence of organic waste.
  • Reduces need for frequent maintenance by continually replenishing beneficial bacteria for 1 and a half to two years
  • Safe for all fish, reptiles, amphibians and other aquatic life
  • Simple to use, no mess aquarium care in fresh or salt water. M size treats tanks from 15 to 40 gallons.

Customer ratings by feature

Easy to use
4.0 4.0
Stability
3.6 3.6
Value for money
3.5 3.5
Sheerness
3.3 3.3
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EcoBio-Block Stone for Aquariums, Medium - Natural Water Clarifier and Odor Remover, Treats 15 to 40 Gallons

EcoBio-Block Stone for Aquariums, Medium - Natural Water Clarifier and Odor Remover, Treats 15 to 40 Gallons

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Product Description

EcoBio-Stones are volcanic rock and cement containing 100% pure beneficial bacteria spores, which effectively clarify cloudy water in aquariums, reducing maintenance. Simply rinse off the EcoBio-Stone, soak overnight and place in aquarium. Using nature's system of purifying water, EcoBio-Stone's beneficial bacteria break down organic waste into ammonia, then into nitrites and then into nitrates, which are processed by vegetation or by anaerobic bacteria changing the nitrates into nitrogen gas, which dissipate into the air. The process of building sufficient amounts of bacteria to take care of the conditions in the average tank, normally results in crystal clear water in 2 to 4 weeks, with a sudden clearing of the water. EcoBio-Stone safely purifies water, eliminates odors and creates a clear and clean environment for fish and other aquatic life. EcoBio-Stone's volcanic stone also leaches back the essential calcium and trace minerals, which are normally returned to water with frequent water changes. This dual action creates a perfect ecosystem. Note: if the water in your tank is very acidic please use EcoBio-Stones after acclimating your fish to pH neutral water by doing water changes.

Product details

  • Product Dimensions ‏ : ‎ 2.63 x 4.1 x 6.1 inches; 1.1 Pounds
  • Manufacturer recommended age ‏ : ‎ 1 month and up
  • Item model number ‏ : ‎ EBSMC00105
  • Department ‏ : ‎ Conditioners & Additives
  • Date First Available ‏ : ‎ June 17, 2010
  • Manufacturer ‏ : ‎ ONEdersave Products LLC
  • ASIN ‏ : ‎ B003SOTWLI
  • Customer Reviews:
    4.1 4.1 out of 5 stars 2,530 ratings

Important information

Directions

Step 1 – Rinse well with chlorine-free water. Step 2 – Soak in chlorine-free water overnight and discard water. Step 3 – Place the EcoBio-Block Product in the aquarium near airstone or where water flows, if possible.

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EcoBio-Block 2-Pack Stone for Aquariums, Medium - Natural Water Clarifier and Odor Remover, Treats 30 to 80 Gallons
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Price$27.93$29.99$15.99$12.99$14.99$52.20
Delivery
Get it as soon as Thursday, May 16
Get it as soon as Thursday, May 16
Get it as soon as Friday, May 17
Get it as soon as Thursday, May 16
Get it as soon as Thursday, May 16
Get it as soon as Thursday, May 16
Customer Ratings
4.14.1 out of 5 stars2,530
4.24.2 out of 5 stars52
4.54.5 out of 5 stars52
4.64.6 out of 5 stars36
4.64.6 out of 5 stars311
4.34.3 out of 5 stars294
Value for money
3.5
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4.1
4.3
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Customer reviews

4.1 out of 5 stars
4.1 out of 5
2,530 global ratings

Customers say

Customers like the health, smell and water clarity of the pet supplies. For example, they mention it helps keep the fish healthy, the water clear and that it stays clean for over a month. That said some dislike particle formation and appearance. Opinions are mixed on quality and value.

AI-generated from the text of customer reviews

150 customers mention108 positive42 negative

Customers like the clarity of the water in their tank. They say the filter rock helps keep the water clear. Some customers also mention that the rock is particularly good at clearing up cloudy water in planted tanks with substrate.

"...2 days in with this filter rock and he’s better, eyes clearing and he’s back out vibrant...." Read more

"...Since they say they will keep the water clear for a year I am very happy for how long they worked. My water is very clear again...." Read more

"...to be by flowing water so i put near the filter and NOPE .just made water cloudy and particles everywhere...So had to change out the water and i set..." Read more

"...These are particularly good at clearing up cloudy water in planted tanks with substrate, and I've used them extensively that way to strong effect." Read more

68 customers mention53 positive15 negative

Customers like the water clearing of the pet supplies. For example, they say it clears the water within three weeks, keeps it clean for over a month, and eliminates algae. Some mention that it cuts down on the amount of cleaning that is needed.

"...It cleared the tank in less than 2 weeks. I would recommend this stone." Read more

"...Overall, though, I find they do a really nice job of reducing the frequency of water changes and keeping the tank water crystal clear...." Read more

"...but this rock helps keeping it nice and clear and cuts down on the amount of cleaning that is needed...." Read more

"...Multiple water changes (50-75% each time) and could not clear the water. I put this stone in it, and a couple of days later, it’s crystal clear...." Read more

26 customers mention26 positive0 negative

Customers say the product is great for keeping fish healthy and happy. They also appreciate the visible healthy ecosystem.

"...at maintaining water clarity, reducing ammonia, and helping keep the tank inhabitants happy...." Read more

"...(1)Redtail Shark, (1)Rafael Catfish and (1)Ghostknife but all the fish are healthy and my tank readings are perfect...." Read more

"...The Fish is healthier. The stone is hella rough for a betta so his fins don't approve, but he mostly gives the stone a berth...." Read more

"These bio blocks are truly amazing...." Read more

21 customers mention15 positive6 negative

Customers like the smell of the pet supplies. They say that the smell is gone after only 4 days.

"...Now the the eco rock has been in water there is no smell and water smell fresh." Read more

"Well it worked for a little while. It did get red of the smell and it keep it clear for a little while...." Read more

"...The ROCK itself changes nothing tank still smells the same and this is after installing a better FILTER, new gravel, scrubbing everything down and..." Read more

"...5 days after I put the bricks in, the water was crystal clear with no odor at all. Im extremely pleased and impressed!..." Read more

166 customers mention101 positive65 negative

Customers are mixed about the quality of the pet supplies. Some mention it's incredible and easy to use, while others say it didn't work.

"very nice" Read more

"...Gradually, of course, they become less effective." Read more

"...Looks like it might work though. Tank looks nice." Read more

"...This is incredible and so easy to use, just wash it off and leave overnight, place it in and sit back and relax! Totally recommend! Wow!" Read more

44 customers mention17 positive27 negative

Customers are mixed about the value of the pet supplies. Some mention it's absolutely worth the money, while others say it'll waste their money.

"...the block is "bad" but I just don't care at this point... bad product and no way to contact manufacturer far as I can find" Read more

"...After 5 days, it is completely clear again. I’m blown away. Totally worth the money." Read more

"...I was a little hesitant because it was rather expensive and I had trouble believing that it really would work that well...." Read more

"...I saw this product in the pet store but it was too expensive. I found it on amazon for $20 cheaper and gave it a shot...." Read more

16 customers mention0 positive16 negative

Customers are dissatisfied with the particle formation of the pet supplies. They mention that it leaves a white substance, gooey stuff, and murky white substance in their tank. Some say that it accumulated white deposits all over and made their tank smell horrific. Some customers also mention that the rock crumbles and leaves debris everywhere on the bottom of the tank.

"...so i put near the filter and NOPE .just made water cloudy and particles everywhere...So had to change out the water and i set it aside in the tank..." Read more

"...Yes, there is some residue that appeared on my glass after the rock was placed in the tank, but I was able to wipe that away and it did not return...." Read more

"...only issue I did have is the rocks pieces falling off, leaving the bottom of my tank dirty but I think it is because it is new...." Read more

"...Can’t blame the product don’t know if it works yet. Seems to attract debris." Read more

15 customers mention0 positive15 negative

Customers are dissatisfied with the appearance of the pet supplies. They mention that it's unnatural looking, and does not go with their tank decoration. Some customers also say that the color of the stone does not match their tank decor.

"This is an unnatural looking square block. I’d like it better if it were a more natural looking shape. Looks like it might work though...." Read more

"...Yes, they are kind of ugly, so I hide them behind foliage in my planted tanks...." Read more

"...The rock is also extremely large, not very attractive, and difficult to hide in my aquascaping...." Read more

"Not only is the rock too big and unnatural looking but many pet stores have cautioned against them." Read more

Square block
4 Stars
Square block
This is an unnatural looking square block. I’d like it better if it were a more natural looking shape. Looks like it might work though. Tank looks nice.
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Top reviews from the United States

Kathy
5.0 out of 5 stars Cloudiness Gone!
Reviewed in the United States on May 3, 2024
Size: MediumVerified Purchase
Before I bought the stone I was having an issue with cloudiness. Bought this stone, soaked it overnight and placed in tank. It cleared the tank in less than 2 weeks. I would recommend this stone.
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William B.
5.0 out of 5 stars very nice
Reviewed in the United States on April 29, 2024
Size: MediumVerified Purchase
very nice
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nancy linkevich
4.0 out of 5 stars Square block
Reviewed in the United States on March 2, 2024
Size: MediumVerified Purchase
This is an unnatural looking square block. I’d like it better if it were a more natural looking shape. Looks like it might work though. Tank looks nice.
Customer image
nancy linkevich
4.0 out of 5 stars Square block
Reviewed in the United States on March 2, 2024
This is an unnatural looking square block. I’d like it better if it were a more natural looking shape. Looks like it might work though. Tank looks nice.
Images in this review
Customer image
Customer image
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RG
5.0 out of 5 stars Amazing
Reviewed in the United States on September 5, 2022
Size: MediumVerified Purchase
Have Geophagus cichlids for years and even raised their babies but always hard to maintain water and waste. Seems to always lose 1 8months to yr with Popeye and I have 2 large enheim filters each 50gal capable and I only have a 55 gal tank and water change and maintain clean tank.. They eat hardy and release waste just as much..

So that was overview and now have another large male with popeye again building past 2 weeks so attacked with new substrate (3 different levels) water changed, new filter pads and continued to get worse to point he’s now hiding and just matter of days.. So I bought this rock figured worth a shot since medicine never works just waste money and stress on fish and only success with 1 over years.

I know long review but worth the understanding of environment. 2 days in with this filter rock and he’s better, eyes clearing and he’s back out vibrant. Not sure how it works but for any fish lovers this is a must bio rock and I will never have a tank without! Even other fish seem happy swimming like youngsters again. Waters been clear so don’t see a difference but underlining water quality must be perfect for them.

Just amazing!

UPDATE: want to give update since I can’t believe what’s happened and might help alot of fish lovers out there.

The Cichlid with Popeye for past weeks now is just about back to normal after 4 days since adding this bio rock. I don’t know if these results are typical, cleaned a particular issue in water or if it was just an added part to water change and complete filter substrate replacement or what but I have never been able to cure Popeye in 8 yrs doing the same things minus this bio rock so this is the first and in 3 days!! He’s back swimming, eating, playing with others, eye swelling and eye fog gone! I’m still in shock but at the least this rock can only be helpful in any tank with fish imo so hopefully it helps others.

And for placement I actually suspended it ontop of a long decorative hollow tree about mid tank level so water can circulate completely around the whole rock to maximize water contact.
14 people found this helpful
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Dad
1.0 out of 5 stars Don’t buy it!
Reviewed in the United States on April 14, 2024
Size: SmallVerified Purchase
My water was crystal clear before I put this rock in. I soaked it for a week, changing the water, before I put it in the tank. This is my water after changing the water & cleaning the filter for 2 days. Terrible decision!
Customer image
Dad
1.0 out of 5 stars Don’t buy it!
Reviewed in the United States on April 14, 2024
My water was crystal clear before I put this rock in. I soaked it for a week, changing the water, before I put it in the tank. This is my water after changing the water & cleaning the filter for 2 days. Terrible decision!
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kim
3.0 out of 5 stars I'll give it a 3 star because my turtle loves it as a bed
Reviewed in the United States on December 2, 2023
Size: MediumVerified Purchase
I bought it and it made more of a mess than my turtle. It crumbles and leaves debris everywhere on bottom of tank, read it had to be by flowing water so i put near the filter and NOPE .just made water cloudy and particles everywhere...So had to change out the water and i set it aside in the tank (no clue why i even put if back in there after having to clean the whole tank because of it) my turtle started pushing it under his basking platform ..and fell asleep on top of it...he uses it as a bed now lol so as long as he's happy and uses it for something i suppose its not a complete waste of money
3 people found this helpful
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Vicki Hodges
5.0 out of 5 stars KEEPS YOUR FISHTANK WATER CLEAR
Reviewed in the United States on January 14, 2024
Size: MediumVerified Purchase
I bought these about three years ago and the water stayed clear up until a month ago so I had to replace them. Since they say they will keep the water clear for a year I am very happy for how long they worked. My water is very clear again. I would highly recommend these to anyone with an aquarium
4 people found this helpful
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Richard A. Mangrum
5.0 out of 5 stars Really works somehow…
Reviewed in the United States on February 15, 2024
Size: MediumVerified Purchase
Not sure how but this really works.
Highly recommend.
45 years of aquarium owning. Where has this been?
2 people found this helpful
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Top reviews from other countries

Cheryl Robertson
3.0 out of 5 stars Tank block
Reviewed in the United Kingdom on March 31, 2021
Size: MediumVerified Purchase
Seems a good acccessory it’s helping keep tank clean and clear
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yw2012
5.0 out of 5 stars Works perfectly!
Reviewed in Canada on November 23, 2019
Size: MediumVerified Purchase
Before having this magic stone, I had to change filter weekly ( filter was black and completely plugged by the end of 1 week) and water change bi-weekly. Now, the filter was clean after 1 week, and water perfectly clear by the end of 2 weeks. I have 6 good sized gold fish in each tank. thanks to this magic EcoBio-Block stone. This is THE single most efficient, and cheapest equipment for fish tank!!
One person found this helpful
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Lynne Irwin
5.0 out of 5 stars Five Stars
Reviewed in Canada on January 29, 2018
Size: MediumVerified Purchase
It works
One person found this helpful
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chantale dambrosio
3.0 out of 5 stars Stone
Reviewed in Canada on August 4, 2019
Size: MediumVerified Purchase
I haven’t noticed any difference for my tank so I can’t really say it helped or not
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Judith Ng
2.0 out of 5 stars The stone fall apart into small pieces under water
Reviewed in Canada on November 12, 2019
Size: MediumVerified Purchase
Cannot use the stone as the stone is easy to fall apart into small pieces in water and my turtle is kept biting the rock. Do not want my turtle to become sick by eating the fall apart tiny pieces.
One person found this helpful
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