Does this go out of date if unused?

No, they are ceramic so they don't go out of date.

Should I put the polishing pads in my filter before or after these rings?

I appreciate this is an old question but I wanted to provide an accurate answer. The order of filtration depends on the type/model of filter you have. Some flow water from the top down, others from the bottom up. You should use coarse sponge first to mechanically filter large bits of diet e.g. plant leaves. Then your fine sponge/floss as this is also mechanical filtration. Next is your chemical filtration like carbon (but you should only use this for removing medication; it's not necessary if you set your tank up correctly). Finally your biological filtration I.e. ceramic rings.

Do I actually need these for a cold/fresh water tank?

They are a good addition to any filter cold or fresh water, as they provide a large surface area that nitrifying (good bacteria) can attach to, to reduce dangerous ammonia (urine) excreted by fish. However frequent water changes will also help whether or not this media is used in your tank. Google the nitrogen cycle in aquarium for more details. Hope this helps.

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Biomax 500 g

Product ID: 48157806

Details

Brand
Fluval
Item form
Granules
Item weight
0.57 Kilograms
Liquid volume
500
Number of Packs
1

💧Maintains stable water characteristics

🦠Superior biological filtration

⚖️500g granules for long-lasting use

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€ 34.00

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Description

🦠 Elevate your aquarium’s ecosystem with Fluval Biomax – where science meets clarity!

WATER CHEMISTRY SAFE - Does not alter your tank’s delicate water parameters
LONG LASTING BIO MEDIA - 500g granules designed to last for years without frequent replacement
BOOST YOUR AQUARIUMS HEALTH - Promotes rapid growth of beneficial bacteria for crystal-clear water
SEEDING FRIENDLY REPLENISHMENT - Replenish only half at a time to maintain optimal bacterial colonies
TRUSTED BY AQUARISTS WORLDWIDE - Highly rated with 4.7 stars and top choice for canister filters

Fluval Biomax 500g is a premium biological filtration media designed to enhance aquarium water quality by fostering beneficial bacteria growth. Its granulated form ensures long-lasting performance without affecting water chemistry, making it a trusted choice for both freshwater and marine tanks.

Specifications

ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	17,557 in Pet Supplies ( See Top 100 in Pet Supplies ) 119 in Aquarium Cleaning Products
Brand Name	Fluval
Customer Reviews	4.7 4.7 out of 5 stars (7,758)
Global Trade Identification Number	00015561114561
Item Form	Granules
Item Type Name	Biomax
Item Weight	0.57 Kilograms
Liquid Volume	500 Millilitres
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	B000HHSG5M
Model Number	A1456
Pet Type	Fish
Product Warranty	FALSE
Target Species	Fish
UPC	015561114561
Unit Count	500.0 gram

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