Does this go out of date if unused?

No, they are ceramic so they don't go out of date.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
1.28 Pounds
Liquid volume
500
Number of Packs
1

🧬Superior biological filtration

♻️Half replenishment for optimal seeding

⚖️500g precise granule weight

€ 27.07

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Description

🧪 Elevate your aquarium’s ecosystem with Fluval Biomax – where science meets serenity.

TRUSTED BY THOUSANDS - Join over 7,800 happy customers who rate it 4.7 stars for consistent performance.
EFFORTLESS MAINTENANCE - Granular form makes dosing simple and mess-free—perfect for busy professionals.
WATER CHEMISTRY FRIENDLY - Engineered to preserve your tank’s natural water parameters without disruption.
NEXT LEVEL FILTRATION POWER - Harness advanced biological filtration to keep your aquarium crystal clear and thriving.
SMART REPLENISHMENT STRATEGY - Replace only half at a time to maintain beneficial bacteria and avoid water shock.

Fluval Biomax 500g is a premium biological filtration media designed to enhance aquarium water quality by supporting beneficial bacteria growth. Its granular form allows easy dosing, and replenishing only half at a time ensures optimal seeding without altering water chemistry. Highly rated by thousands, it’s a must-have for maintaining a healthy aquatic environment.

Specifications

ASIN	B000HHSG5M
Allergen Information	Allergen-Free
Best Sellers Rank	19,625 in Pet Supplies ( See Top 100 in Pet Supplies ) 130 in Aquarium Cleaning Products
Brand Name	Fluval
Country Of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (7,847)
Global Trade Identification Number	00015561114561
Item Form	Granules
Item Type Name	Biomax
Item Weight	1.28 Pounds
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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TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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€ 27.07

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews