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💎 Dive into crystal-clear waters—because your aquarium deserves the spotlight!
Tetra CrystalWater is a 250ml liquid treatment designed to eliminate cloudiness in aquarium and pond water within 6 to 12 hours. Using a mineral-based formula, it binds fine dirt particles for easy removal by your filter, restoring sparkling clarity without harming fish. Ideal for freshwater tanks without invertebrates, it’s a must-have for maintaining a pristine aquatic environment.








| ASIN | B005P7ESII |
| Best Sellers Rank | 1,250 in Pet Supplies ( See Top 100 in Pet Supplies ) 12 in Aquarium Water Treatments |
| Brand Name | Tetra |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.3 4.3 out of 5 stars (4,872) |
| Global Trade Identification Number | 04004218144132 |
| Item Form | Liquid |
| Item Type Name | food |
| Item Weight | 249 g |
| Liquid Volume | 250 Millilitres |
| Manufacturer | Spectrum Brands |
| Manufacturer Part Number | T273 |
| Model Number | T273 |
| Target Species | Fish |
| Unit Count | 250.0 millilitre |
K**R
Best product out there for clearing gunk in the pond.
I don't normally write reviews but felt I had to on this product. After many many attempts last year to try and find something that would bind all the gross stuff in a fish pond together that would make it easy to get out using a net I finally found it! Honestly it's amazing stuff. I didn't know what to expect as it is very unclear but after measuring out the correct dose I quietly hoped something would work. The next day I went out and floating on top the water was lots of rubbish that had left the bottom. I cleaned it all out with a net and kept that up for another day and now my water is soooo clear and we have happy fish again. Will make it part of my weekly clean now.
L**W
Worked really well
This product worked brilliantly, my mini pond water was cloudy and smelly but within a day the water was clear and the smell went away. I don’t have and fish in the pond but I have plants and they were fine
Y**M
Works Well
My pond water was very green and I initially didn't expect or see much difference after only one treatment. I followed up with another dose a couple of weeks later and the difference is pretty amazing. I still have enough left for more treatments and would definitely recommend this product.
K**N
Impressed but make sure your KH is high enough before use.
Update.. I have now used this several times with fish in my pond its pristine now my biofilter is good mashes the pictures on here look awful lol. I make sure my KH is high enough and no signs of distress in my fish at all just crystal clear water.......I have seen the reviews saying this killed all the fish however my review is based on use in a new wildlife pond which currently has no fish but lots of tadpoles and baby frogs and nothing died. Having waited to no avail for my all in one filter and UV to clear my pond i decided to try this to get the water clear before adding any fish .. WOW... I was impressed. I mixed the correct dose with pond water in a watering can and evenly spread round the pond. It has a slight milky hue for a few moments but literally within about 10 minutes i could see the pond was full of suspended clumped particles. 24 hrs of filtering later and the difference in water clarity was amazing. The gunk that i rinses out of my filter 2 days after use was quite shocking ewwww Only criticism i can have is amazon sent me a German version with not a single word of English in the instructions so i had to go to tetra website. I also cannot find anything that tells you how frequently you should use this... The. Website however is very very clear that your KH (carbonate hardness) must be above a certain level to use the product so i suspect this absolutely floors your PH if its not buffered by a high enough KH which could explain the fish deaths. Easy enough to avoid any dramatic ph change by ensuring your KH is 6 or over as per the tetra web page instructions. My before abs x after pics don't do the result full justice to be honest. I will use this again.
S**.
No great results yet!
Hasn’t cleared the water in our pond.
F**S
Works
Works like a dream
R**R
It really works well
Fantastic product, made my pond water as clear as Gin. !!
H**O
May need several applications
May need several applications, still quite cloudy pond water No measuring cup.
A**L
Funciona 👍🏻
A**A
This product works quite fast and doesn't trouble the fish
N**O
Produit qui tiens toutes ces promesses
L**O
Liquidò perfetto per il mio laghetto. Tiene L acqua molto pulita. Ogni settimana alla pulizia del laghetto ne metto la dose giusta e vado avanti così ogni settimana.
A**E
Enda produkt som fungerar i damm
Trustpilot
1 month ago
3 weeks ago