does it need to go in a filter or can you just put hang it in the aquarium

Hi,I have a large external filter for my 5ft tank, so I put it inside the filter. As far as I'm aware, it's designed to be used in a filter, so that the water passes through it. I don't think that it would work as efficiently just dropped into the tank.I hope this has helped.

Can this be used in a U3 fluval internal filter or should i buy an external filter?

I have the fluval u4 filters and there is no room as these are large bags so I place it at the bottom of my aquarium and it works perfectly well

Why is this not suitible for salt water?

Because of how this works, salt causes the product to release the ammonia it absorbed (recharging it). So it won't absorb any in a marine tank. In fresh water it will work and when ammonia levels spike this can be pulled out, soaked in 5% salt solution, washed (in aquarium water) and dried. Then popped back in......if you're having to use this though...... Address the ammonia causing issue front end..... Too much food, over stocked, poor filtration.......etc. Good product but a reactive not a proactive one.

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Fluval Ammonia Remover for Freshwater Aquariums, 540 g

Fluval Ammonia Remover for Freshwater Aquariums, 540 g

Product ID: 48572989

Details

Brand
Fluval
Item form
Granules
Item weight
590 g
Number of Packs
3
Unit count
540.0 gram

💧Removes toxic ammonia fast

🛒3-pack for cost-effective use

⚗️540g high-capacity granules

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Description

💧 Keep your fish thriving with ammonia-free perfection!

TRIPLE VALUE PACK - Economical 3-pack inserts to maintain continuous water quality without breaking the bank.
EFFORTLESS INTEGRATION - Fits seamlessly into external filters for quick, hassle-free installation.
TRUSTED BY ENTHUSIASTS - Highly rated with 4.6 stars from over 2,500 reviews—join the community of satisfied aquarium pros.
TAILORED FOR FRESHWATER - Specifically designed for freshwater tanks, ensuring optimal fish health and balance.
CRYSTAL CLEAR WATER ALWAYS - Effectively eliminates harmful ammonia to keep your freshwater aquarium pristine.

Fluval Ammonia Remover is a 540g granular treatment designed exclusively for freshwater aquariums. It rapidly removes toxic ammonia, promoting a healthy environment for well-stocked tanks. Sold in a convenient 3-pack, it fits easily into external filters and is trusted by thousands of aquarium enthusiasts worldwide.

Specifications

ASIN	B0002AQKK2
Best Sellers Rank	7,572 in Pet Supplies ( See Top 100 in Pet Supplies ) 94 in Aquarium Water Treatments
Brand Name	Fluval
Country Of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (2,528)
Global Trade Identification Number	00015561114806
Item Form	Granules
Item Type Name	Ammonia Remover, 3 x 180 g
Item Weight	590 g
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	A1480
Model Number	A1480
Pet Type	Fish
Target Species	Fish
UPC	015561114806
Unit Count	540.0 gram

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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