Based on this product's specifications, here are some alternatives and similar models
Biological Filter Media Sera Siporax Professional 15 mm, 14.5 kg
Summary description:
Sera Siporax Professional is a biological filter media with 15 mm particle size, supplied as a 14.5 kg pack. Designed for aquarium and pond filtration, it provides surface area for beneficial bacteria to colonize and support biological nitrification. Suitable for canister, trickle and other mechanical/biological filter systems where stable ammonia and nitrite removal is required.