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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💧 Clear water, clear mind—phosphate removal made effortless!

TRIPLE POWER PACK - Three 100g granules for extended, hassle-free phosphate control
VERSATILE APPLICATION - Use in freshwater or saltwater aquariums—flexibility that fits your setup
EFFORTLESS INTEGRATION - Place directly in your filter or tank—no complicated steps, just results
OPTIMIZED WATER CLARITY - Effectively removes phosphates to prevent algae bloom and keep water crystal clear
ODOR MAINTENANCE CONTROL - Reduces unpleasant odors while simplifying tank upkeep

FluvalClear Max Phosphate Remover is a 3-pack of 100g granules designed to treat up to 27 gallons of aquarium water. Suitable for both freshwater and saltwater tanks, it reduces phosphates to prevent algae growth and odors, making maintenance easier. The granules can be placed directly in the filter or water, offering flexible and effective phosphate control for all aquarium sizes.

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Pet Type	Fish
Product Dimensions	6.86 x 11.43 x 15.75 cm; 333 g
Item model number	A1348
Breed Recommendation	All Sizes
Item Form	Granules
Colour	Brown
Size	300g
Number of Items	1
Quantity	1
Special features	Easy to use
Batteries required	No
Batteries Included	No
Item Weight	333 g

Fluval Clear Max Phosphate Remover 300g - 3 x 100g - treats 3 x 100L,Brown

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