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

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

Product ID: 3891525

Details

Brand
Fluval
Item Form
Insert
Item Weight
0.01 Ounces
Liquid Volume
20 Gallons
Manufacturer
Rolf C. Hagen

🌊Fits AquaClear 20, supports fresh & saltwater

🦠30% boost in bio-filtration efficiency

♻️Large surface area for beneficial bacteria

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Details

Brand
Fluval
Item Form
Insert
Item Weight
0.01 Ounces

Description

🦠 Elevate Your Aquarium’s Ecosystem—Because Your Fish Deserve the Best!

COMPACT YET POWERFUL - Small footprint (1.8 x 2.5 x 3.5 inches) packs a punch in maintaining crystal-clear water and a thriving tank environment.
EFFORTLESS INSTALLATION - Comes in a convenient mesh bag designed for quick, no-fuss replacement in your AquaClear 20 Power Filter.
TRUSTED BRAND RELIABILITY - From Fluval, a leader in aquarium care, ensuring consistent quality and peace of mind for your aquatic ecosystem.
MAXIMIZE YOUR TANKS HEALTH - BioMax’s advanced bio-ring structure promotes rapid beneficial bacteria growth, slashing ammonia and nitrite levels by 30%.
VERSATILE AQUARIUM COMPATIBILITY - Perfectly engineered for both freshwater and saltwater tanks up to 20 gallons—your all-in-one filtration upgrade.

The AquaClear 20 BioMax replacement media is a scientifically designed filtration insert that enhances biological filtration by 30% through its unique bio-ring pore structure. Compatible with AquaClear 20 Power Filters, it supports both freshwater and saltwater aquariums up to 20 gallons. Easy to install and backed by Fluval’s trusted brand, it effectively reduces harmful ammonia and nitrite, ensuring a healthier aquatic environment.

Specifications

ASIN	B0006JLO5K
Allergen Information	Nut Free
Best Sellers Rank	#7,754 in Pet Supplies ( See Top 100 in Pet Supplies ) #96 in Aquarium Filter Accessories
Brand	Fluval
Brand Name	Fluval
Customer Reviews	4.7 out of 5 stars 9,263 Reviews
Global Trade Identification Number	00015561113700
Included Components	All Items in Description
Item Form	Insert
Item Type Name	Aquarium Filter Media
Item Weight	0.01 Ounces
Liquid Volume	20 Gallons
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	A1370A1
Model Number	A1370A1
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	015561113700
Unit Count	60 Grams
Warranty Description	Manufacturer Warranty

Reviews

V**V

6.02.2026

B**M

14.03.2026

B**N

6.03.2026

K**N

23.04.2026

T**O

6.01.2026

D**G

12.03.2026

C**R

4.02.2026

A**R

9.04.2026

J**S

13.08.2025

P**D

17.06.2024

A**R

1.03.2020

M**I

1.07.2025

V**2

24.12.2025

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