CerMedia MarinePure Block Bio-Filter Media for Marine and Freshwater Aquariums, 8 by 8 by 4-Inch

I feel it is the best for media bacteria, why I gave 4 star coz I received some small part is break, but anyway function still good. Otherwise I will give 5 star

I received the item broken. Please return it

Bought the large brick as I have used MarinePure for years. I used 3cft of it in my koi pond shower and used it in multiple fresh water set ups as well. I ordered this for my reef tank and as expected it is a great biological filtration choice. It does its job due to its porous design however it doesn't handle rough shipping well. My brick came broken in half. It doesn't look great but it lost none of its function. I would buy this over and over again in figure set ups without a single concern.

tenia dudas al comprar por que vi que llegaban rotas pero ya mejoraron el empaque por que venia en una caja que dentro tenia otra caja y dentro de esta venia el producto con su empaque original, bien protegida excelente servicio y ya esta funcionando en mi acuario

Great product. Must for marine aquarium . I have seen many videos of abroad using it

Have a heavily overstocked aquarium with two of these. Never had any problems with water quality. Fantastic product, bit expensive though.

Delivered exactly as I expected. The product should be a great aid to my freshwater tank.