Does this go out of date if unused?

No, they are ceramic so they don't go out of date.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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Fluval Biomax 500 g

Product ID: 48157806

Details

Brand
Fluval
Item form
Granules
Item weight
581 g
Liquid volume
500
Number of Packs
1

⏳Enormous capacity for optimal contact time

💧Maintains water chemistry, no impact

🧬Complex pore system for max bacteria growth

Description

🧪 Elevate your aquarium’s health with next-level biofiltration!

EASY MAINTENANCE - Replenish only half at a time to maintain bacterial seeding and continuous filtration.
TRUSTED BY THOUSANDS - Highly rated with 4.7 stars from over 7,800 aquarists who demand peak performance.
WATER CHEMISTRY SAFE - Does not alter water parameters, preserving your aquarium’s delicate ecosystem.
OPTIMIZED CONTACT TIME - Large surface area maximizes filtration efficiency by extending bacteria exposure to water.
SUPERIOR BIOLOGICAL FILTRATION - Harnesses a complex pore network to cultivate beneficial bacteria, ensuring crystal-clear water.

Fluval Biomax 500g features a sophisticated porous design that supports beneficial bacteria growth, significantly reducing ammonia and nitrite levels without altering water chemistry. Its large capacity ensures extended contact time for superior biological filtration, making it a top choice for maintaining a healthy, balanced aquarium environment.

Specifications

ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	33,951 in Pet Supplies ( See Top 100 in Pet Supplies ) 244 in Aquarium Cleaning Products
Brand Name	Fluval
Customer Reviews	4.7 4.7 out of 5 stars (7,838)
Global Trade Identification Number	00015561114561
Item Form	Granules
Item Type Name	Biomax
Item Weight	581 g
Liquid Volume	500 Millilitres
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	B000HHSG5M
Model Number	A1456
Number of Items	1
Number of Packs	1
Pet Type	Fish
Product Warranty	FALSE
Target Species	Fish
UPC	015561114561
Unit Count	500.0 gram

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