What do you put inside these?

Anything you want. I use mine to put in Ammonium granules to filter out the ammonia. It fits behind my filter cartridge. I like to think that it has been effective.

I'll be using two of these, and two disposable .Does it matter which is in front and which is in back? Is this overkill?

Hey Joseph!If you are putting live plants in your aquarium you don't want to use the disposable ones at all. The carbon filtration takes dissolved organic carbons out of the water and plants need those.But... no plants, then no worries.I bought 4 of these. I put filter floss in two cartridges and bio media in another two cartridges. Bio media first to catch all the big stuff and get that great bacterial load growing which does most of your real waste management for you (biological filtration). That and your live plants ;)But even with no plants, and no need to avoid the carbon filter, the great thing about bio media is that to clean it you just give it a vigorous shake in a pail of old tank water (or clean de-chlorinated water)! That way you preserve your biological filter and never need to replace it. The bio media lasts indefinitely.Marineland PA0100 Bonded Filter Pad, 312-Square-Inchttp://www.amazon.com/gp/aw/d/B0002565PWSeachem Matrix Bio Media 1 Literhttp://www.amazon.com/gp/aw/d/B0002A5VIO

Would polyfill be ok in these? I have a 350 and plan on using the first two with polyfill and the back two as my biological/chemical filtration.

I think you can put whatever media you choose but you will have to cut the polyfill to fit each compartment because the cartridge is made for charcoal pellets, the inside has separate compartments. If you look closely at the photo, you will see horizontal lines separating vertical lines; each of those horizontal line is a divider.

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♻️ Keep your aquarium pristine with refillable power – because your fish deserve the best!

TRUSTED BRAND LEGACY - Backed by 40+ years of Marineland innovation, the pro’s choice for aquarium excellence.
ECO SMART REFILL SYSTEM - Easily add carbon or media monthly to maintain crystal-clear water without waste.
SECURE SNAP LOCK CLOSURE - Innovative cartridge snaps open and locks tight to eliminate messy spills and leaks.
MAXIMIZED FILTRATION FLOW - Ribbed design ensures optimal water circulation for superior chemical and mechanical filtration.
PRECISION FIT COMPATIBILITY - Seamlessly fits Marineland Penguin 200 & 350 Power Filters for hassle-free upgrades.

The Marineland Penguin Refillable Media Cartridge (PA10093) is a durable, easy-to-use filtration accessory designed for Marineland Penguin 200 and 350 Power Filters. Featuring a refillable frame compatible with carbon and other media, it offers chemical and mechanical filtration with a ribbed design for optimal water flow. Its snap-lock closure prevents spillage, making monthly refills clean and convenient. Trusted by professionals for over 40 years, this cartridge ensures your aquarium stays sparkling and healthy.

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Product Dimensions	2.54 x 17.78 x 27.94 cm; 98.88 g
Batteries	Product Specific batteries required.
Item model number	PA10093
Assembly Required	No
Batteries Required?	No
Batteries included?	No
Material Type(s)	Other
Colour	Black
ASIN	B0009YHSE8

MarineLandPenguin Refillable Media Cartridge, Fits 200 And 350 Power Filters (PA10093)

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