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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♻️ Transform your aquarium’s health with Purigen’s smart, sustainable filtration!

COMPACT POWERFUL - 250 ml pack fits seamlessly into your filter setup without bulk, perfect for busy professionals.
TRIPLE TOXIN CONTROL - Effectively reduces ammonia, nitrite, and nitrate levels to keep your aquatic ecosystem balanced.
SMART COLOR INDICATOR - Beads shift from beige to dark brown, signaling when regeneration is needed—never guess again.
ECO FRIENDLY REGENERATION - Easily restored with a simple bleach soak, extending media life and saving costs.
ULTRA PURE AQUARIUM WATER - Eliminates organic waste faster than standard filters for crystal-clear tanks.

Seachem Purigen Freshwater 250 ml is a premium filtration media designed to remove organic waste with unmatched efficiency. Its unique beads change color to indicate exhaustion and can be regenerated multiple times, ensuring long-lasting performance. Ideal for controlling harmful ammonia, nitrite, and nitrate levels, it supports a healthier aquatic environment in a compact, easy-to-use form.

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HK$434

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TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

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Pet Type	Fish
Product Dimensions	12.45 x 6.1 x 5.84 cm; 230 g
Item model number	166
Item Form	Beads
Allergen Information	Yam Free
Colour	Mehrfarbig
Size	250 ml (Pack of 1)
Volume	250 Millilitres
Number of Items	1
Quantity	1
Specific Uses	Filtration in Aquariums
Batteries required	No
Batteries Included	No
External Testing Certification	Não aplicável
Item Weight	230 g

SeachemPurigen Freshwater, 250 ml

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