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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💧 Crystal-clear water, smarter filtration — Purigen perfection!

COMPACT EFFICIENT - 250 ml pack fits seamlessly into any freshwater aquarium setup.
SMART COLOR INDICATOR - Know exactly when to regenerate with intuitive color changes.
ECO FRIENDLY REUSABLE - Regenerate and reuse Purigen beads for sustainable filtration power.
AMMONIA NITRATE CONTROL - Keep your aquatic ecosystem balanced and thriving effortlessly.
ULTRA PURE AQUARIUM WATER - Maximize clarity with SeachemPurigen’s superior organic removal.

SeachemPurigen Freshwater (250 ml) is a premium aquarium filtration media designed to remove organic waste with unmatched efficiency. It actively controls harmful ammonia, nitrite, and nitrate levels, ensuring a healthier aquatic environment. Featuring a unique color-changing indicator, it signals when regeneration is needed, making maintenance effortless. Compact and reusable, Purigen is the go-to solution for freshwater aquarium enthusiasts seeking pristine water quality.

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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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