Does this act like purigen? Does it make the water clearer? Or is that the carbon?

The BioMax media is basically an insert that provides a place for beneficial bacteria to grow. These good bacteria will help reduce the levels of ammonia and nitrite in your system. Purigen is an actual absorbing type product that removes impurities from your system water. I listed some differences between purigen and carbon below.Purigen ) Removes things in the water before they turn into Nitrates slowing water degradation) Clears up the water making it sparkling clear) Can be regenerated multiple times) May last for quite awhile before it is exhausted and needs to be regenerated depending on it use) Does not effect or remove medicines ) Turns darker brown color as it is exhausted and lightens again after regenerationCarbon) Removes most medicines) Cannot be generated) Usually is exhausted relatively quickly) Removes things in the water but does not clear the water) Can leech things back into the water it once removed if it is not changed once exhausted) Shows NO changes as it is exhaustedCarbon is similar to the purigen product in that it absorbs odors, discoloration and impurities in your water but they areHope this helps answer your question.

Does it matter what size? I want to save money and get the 70 gal for my 3 gal tank lol

The size doesn't matter, I bought the cheapest one and took the biomax out of the bag so they fit-for a 3 gallon from the 70, divide the biomax bag equally into about 12 piles, then put one of the piles into your filter and save the rest (as you will want to change them out eventually) this should give you enough filtration for a 3 gallon with out overdoing it.

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🧬 Elevate your aquarium’s ecosystem with BioMax brilliance!

COMPACT YET MIGHTY - Small footprint with big impact—perfect for tanks up to 20 gallons without taking up extra space.
EFFORTLESS UPGRADE - Mesh bag design allows quick, no-fuss installation—get back to enjoying your aquarium faster.
CUT TOXICITY BY 30 - Effectively reduces harmful ammonia and nitrite levels, keeping your aquatic friends safe and thriving.
VERSATILE COMPATIBILITY - Engineered exclusively for AquaClear 20 Power Filter, ideal for both freshwater and saltwater setups.
TURBOCHARGE YOUR TANKS HEALTH - BioMax's advanced bio-ring structure maximizes beneficial bacteria growth for crystal-clear water.

The AquaClear 20 BioMax replacement media is engineered to fit the AquaClear 20 Power Filter, providing a large surface area for beneficial bacteria colonization. This biological filtration media reduces ammonia and nitrite toxins by up to 30%, enhancing water quality in freshwater and saltwater aquariums up to 20 gallons. Its mesh bag design ensures easy installation, making it an essential upgrade for maintaining a healthy aquatic environment.

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Pet Type	Freshwater Fish
Product Dimensions	4.57 x 6.35 x 8.89 cm; 0.28 g
Item model number	A1370A1
Pet Life Stage	All Life Stages
Flavor	Flavorless
Item Form	Insert
Allergen Information	Nut Free
Color	White
Size	1 Pack
Number of Items	1
Quantity	1
Specific Uses	Indoor
batteries required	No
Batteries Included	No
Item Weight	0.28 g

Aquaclear Aqua Clear 20 BioMax, Aquarium Filter Replacement Media, A1370A1

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