Can it be put in the Fluval C3 Filter?

Yes, you can put it in the c-3 filter, but what I do is pretreat my water in a separate tank with Clearmax to remove the phosphates from our well water. For this I use a 5 gallon tank and a topfin filter, just put the bag of Clearmax where the charcoal filter goes. I use a little salt, and stress coat in the actual tank. I have never had a bad reaction, and my (adult) kids laugh about my tank full of invisible (not rare, just hard to find) fish. I am not aware of any phosphate remover that does not have an iron oxide component.If you issue is not your water source you might look to the food. I found that certain foods spiked the phosphorus levels, oddly enough, in my tank API foods that promised not to cause algae were the biggest problem.

Fluval, the back of the box states it treats 300L. Is this for each 100g pack or does it mean a total of 3 packs?

I am pretty sure it's for each 100g pack. There is no way that any filter for that size tank could hold 3, especially since the bag needs to be weighted down or it will float.

Is one pack of fluval clearmax enough for a 55 gallon tank?

kinda goes by how hi the test are and number of packets use. older tank 55 gallon i would probably use the 3 packs and test 1st day and 35th day

Would this remove the beneficial tannins from Indian Almond Leaves?

so that is a good question. I would think yes. But it really is for older setups

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Fluval Clearmax Phosphate Remover Filters, 3.5 Ounces - 3-Pack

Fluval Clearmax Phosphate Remover Filters, 3.5 Ounces - 3-Pack

Product ID: 225059161

Details

Brand
Fluval
Item Form
Granules
Item Weight
0.33 Kilograms
Liquid Volume
100 Litres
Number of Packs
3

🌿Removes phosphate, nitrite & nitrate

💧3x 100g resin bags

⚙️Compatible with Fluval 06, 07, FX filters

Description

💎 Elevate your aquarium game with crystal clarity that turns heads!

TRIPLE PACK POWER - Three 100g nylon bags for continuous crystal-clear water
MONTHLY REFRESH RITUAL - Easy monthly replacement keeps your aquatic ecosystem thriving
SEAMLESS COMPATIBILITY - Designed to fit Fluval Series Canister Filters 06, 07, FX & more
FRESH SALTWATER READY - Versatile formula supports both freshwater and saltwater aquariums
ADVANCED WATER CLARIFICATION - Premium resin absorbs phosphate, nitrite, and nitrate for pristine tanks

Fluval Clearmax Phosphate Remover Filters come as a 3-pack of 100g resin bags engineered to absorb phosphate, nitrite, and nitrate, dramatically improving water clarity and reducing aquarium maintenance. Compatible with Fluval Series Canister Filters 06, 07, FX, and more, this versatile media supports both freshwater and saltwater tanks (note: nitrate removal is limited in saltwater). Monthly replacement ensures optimal performance, making it a must-have for aquarists seeking vibrant, healthy aquatic environments.

Specifications

ASIN	B0002DHQIY
Allergen Information	Nut Free
Best Sellers Rank	#75,533 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,548 in Water Treatments
Brand Name	Fluval
Customer Reviews	4.6 4.6 out of 5 stars (5,076)
Global Trade Identification Number	00015561113489
Importer Contact Information	ATM RETAIL 1st Floor Beside P and T Building Lakdi Ka Pul Hyderabad Telangana 500004
Included Components	All Items in Description
Item Form	Granules
Item Highlight	Chemical Filter Media for Aquariums, Nylon Bags, A1348
Item Type Name	Hagen GREEN-X PHOS REMOVER 3PCH
Item Weight	0.33 Kilograms
Liquid Volume	100 Litres
Manufacturer	Fluval
Manufacturer Part Number	A1348
Model Number	A1348
Number Of Items	1
Number of Packs	3
Pet Type	Fish
Target Species	Fish
UPC	015561113489
Unit Count	3.0 Count
country-of-origin	USA

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