is it meant to have a rotten fish smell?

It does smell a bit when first opened, its fine to use.

Heard so many good reports about this product but can it be used in internal filter, i have Juwel Bioflow 3 in 125L tank.

I was able to fit the sachet into one of the side housings inside a Fluval U2 pump (as supplied with my 90 litre tank). All I had to do was remove the sponge and carbon pad. It’s only been running 5 hours and I can see a difference already. I also dosed with Seachem Pristine.

How many of this for a 510 liter tank grams ???

Its treating up to 1000l so one should be enough you may need to recharged it quicker due your tank size

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Seachem Purigen Freshwater, 250 ml

Product ID: 50284066

Details

Brand
Seachem
Item form
Beads
Item weight
0.5 Pounds
Liquid volume
250
Unit count
250.0

🧽Highest organic removal capacity

♻️Color-change regeneration indicator

⚗️Controls ammonia, nitrite & nitrate

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Description

♻️ Elevate your aquarium’s clarity game—because your fish deserve the best!

TRUSTED BY PROS - Top-rated with 4.7 stars from over 17,000 users, backed by a 3-year warranty for peace of mind.
EASY REGENERATION - Simply bleach and rinse to restore Purigen’s powerful filtration, saving you money and hassle.
TRIPLE TOXIN CONTROL - Effectively manages ammonia, nitrite, and nitrate levels to keep your aquatic ecosystem thriving.
SMART COLOR INDICATOR - Visual color change alerts you exactly when regeneration is needed—never guess again.
ULTIMATE ORGANIC PURIFIER - Removes impurities faster than standard filters for crystal-clear water.

Seachem Purigen Freshwater 250 ml is a premium filtration media designed to remove organic waste and control harmful toxins like ammonia, nitrite, and nitrate in freshwater aquariums. Featuring a unique color-changing bead system, it signals when regeneration is needed, which can be easily done with a bleach solution. Trusted by thousands of aquarists worldwide, it ensures superior water quality and healthier aquatic life.

Specifications

ASIN	B000255PJE
Allergen Information	Yam Free
Best Sellers Rank	1,250 in Pet Supplies ( See Top 100 in Pet Supplies ) 6 in Aquarium Water Treatments
Brand Name	Seachem
Country Of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (15,922)
Global Trade Identification Number	00000116016605, 00015568976827
Included Components	Filtration
Item Form	Beads
Item Type Name	Seachem Purigen Freshwater, 250 ml
Item Weight	0.5 Pounds
Liquid Volume	250 Millilitres
Manufacturer	Seachem
Manufacturer Part Number	75185
Model Number	166
Number of Items	1
Pet Type	Fish
Product Warranty	3 years
Target Species	Fish
UPC	015568976827 000116016605
Unit Count	250.0 millilitre

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$64.41

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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