Home › Finds › Biochemical

9 best biochemical under $5.00

We picked 9 biochemical from AliExpress with real orders and good reviews. Prices go from $1.15 to $4.51, the average rating is 4.9 stars and the most popular one has 7.2k orders. Every product opens on AliExpress, where you pay with buyer protection.

Updated: 2026-11

1. 1-56%Aquarium Filter for Aquarium Fish Tank Air Pump Skimmer Biochemical Sponge Filter Aquarium Bio Filters$4.51 $10.23★ 4.9 · 7.2k soldView on AliExpress →
2. 2-66%Aquarium Accessories Biochemical Cotton Filter Fish Tank Pond Foam Sponge Filter Black 15 25 35 50PPI Used$1.15 $3.39★ 4.8 · 7k soldView on AliExpress →
3. 3-54%3cm Thick Aquarium Filter Super Thick Biochemical Filter Cotton Sponge for Aquarium Fish Tank Bio Cotton$3.56 $7.66★ 4.9 · 5.6k soldView on AliExpress →
4. 4-53%Aquarium Filter Super Thick Biochemical Filter Cotton Sponge for Aquarium Fish Tank Bio Cotton Foam Skimmer$4.09 $8.63★ 4.9 · 4.9k soldView on AliExpress →
5. 5-56%9Layers Aquarium Fish Tank Filter Sponge No Glue Foam Biochemical Cotton Aquarium Filtration Accessories Bio$3.66 $8.32★ 4.9 · 4.4k soldView on AliExpress →
6. 6-40%Aquarium Filter Sponge For Fish Tank Air Pump Skimmer Biochemical Sponge Filter Aquarium Bio Filter Filtro$1.15 $1.93★ 4.8 · 3.2k soldView on AliExpress →
7. 7-57%Aquarium Filter for Aquarium Fish Tank Air Pump Skimmer Biochemical Sponge Filter Aquarium Bio Filter Filtro$3.88 $9.05★ 4.9 · 2.1k soldView on AliExpress →
8. 8-75%3 Sizes Fish Tank Air Pump Skimmer Aquarium Fish Filter Accessories Practical Aquarium Biochemical Sponge$2.20 $8.68★ 4.8 · 1.7k soldView on AliExpress →
9. 9-73%100g 250g 500g Nano Aquarium Bio Balls Biochemical Ball Filter Media for Aquarium Filter Accessories for$4.51 $16.45★ 4.8 · 1.6k soldView on AliExpress →

Prices and ratings come from AliExpress and can change. We may earn a commission when you buy through our links, at no extra cost to you.