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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💧 Elevate your aquarium game with Fluval ClearMax – because your fish deserve the clearest water in the room.

OPTIMIZED FILTER FIT - Designed to seamlessly integrate with Fluval Series Canister Filters 06, 07, FX and more.
EFFORTLESS MAINTENANCE - Reduces odors and simplifies tank upkeep—less hassle, more enjoyment.
SUSTAINABLE SMART USAGE - Replace monthly and stagger media changes to maintain constant biological balance.
CRYSTAL CLEAR WATER EVERY TIME - Advanced resin absorbs phosphate, nitrite & nitrate for pristine aquariums.
UNIVERSAL AQUARIUM COMPATIBILITY - Perfect for both freshwater and saltwater setups (note: nitrate removal limited in saltwater).

Fluval ClearMax Phosphate Remover Filters are premium-grade resin media designed to absorb phosphate, nitrite, and nitrate, ensuring crystal clear water and reduced aquarium maintenance. Compatible with Fluval Series Canister Filters 06, 07, FX, and others, this 3-pack of 3.5-ounce nylon bags supports both freshwater and saltwater tanks (with limited nitrate removal in saltwater). Monthly replacement is recommended to maintain optimal water clarity and biological activity.

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Brand	Fluval
Liquid Volume	100 Litres
Item Weight	0.33 Kilograms
Item Form	Granules
Manufacturer	Fluval
UPC	015561113489 015561113762
Global Trade Identification Number	00015561113489
Department	Unisex-Adult
Country of Origin	USA
Item model number	A1348
Product Dimensions	6.86 x 11.43 x 15.75 cm; 333 g
ASIN	B0002DHQIY

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

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