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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– Genuine Fluval Ammonia Remover, Filter Media for External Filters, 540g

Product ID: 48572989

Details

Brand
Fluval
Item form
Granules
Item weight
1.3 Pounds
Number of Packs
3
Unit count
540.0 gram

⚡Fast-acting ammonia control

🧪Chemical filtration granules

♻️Monthly replacement for peak performance

R897

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Description

♻️ Keep your aquarium thriving with Fluval’s fast-acting ammonia shield!

VERSATILE COMPATIBILITY - Seamlessly integrates with canister, hang-on-back, and internal filters for flexible aquarium setups.
PREMIUM CHEMICAL FILTRATION - High-quality granules designed to naturally bind ammonia, ensuring crystal-clear, healthy water.
RAPID AMMONIA NEUTRALIZATION - Instantly stabilizes water to protect your aquatic ecosystem from toxic ammonia spikes.
ROUTINE MAINTENANCE REMINDER - Replace monthly to maintain optimal water conditions and keep your fish thriving.
OPTIMIZED FOR NEW HEAVILY STOCKED TANKS - Perfectly engineered to support both fresh setups and densely populated tanks, reducing fish stress.

Genuine Fluval Ammonia Remover is a 540g premium chemical filtration media designed to rapidly absorb and control toxic ammonia in freshwater aquariums. Ideal for new setups and heavily stocked tanks, it fits most filter types and requires monthly replacement to maintain optimal water quality and fish health.

Specifications

ASIN	B0002AQKK2
Best Sellers Rank	11,619 in Pet Supplies ( See Top 100 in Pet Supplies ) 139 in Aquarium Water Treatments
Brand Name	Fluval
Country Of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (2,575)
Global Trade Identification Number	00015561114806
Included Components	Fluval Ammonia Remover, Chemical Filter Media for Freshwater Aquariums, 3-Pack
Item Form	Granules
Item Type Name	Ammonia Remover, 3 x 180 g
Item Weight	1.3 Pounds
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	A1480
Model Number	A1480
Number of Items	1
Number of Packs	3
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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R897

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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2 days ago

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5 days ago

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