Maxspect Nano-Tech Bio-Block (Pack of 2)

Fit perfect. Feel strong.

Another great purchase form Chartered Aquatics, quick delivery, great customer service課_. THANK YOU.

Quick easy cheap

Brilliant

Great stuff

Brilliant product

Great bio blocks for the sump

Only a quarter of the size of a marine pure block but with loads more capacity for bacteria. They are also capable of achieving anaerobic filtration as well as airobic filtration which most can't. Also these are tough. Really tough. They don't crumble, dent or break as soon as you touch them loosing valuable real estate. I tried cutting one in half with an electric saw and it took the best part of an hour. They are manufactured from bead like particles so any muck that gets stuck on them breaks down and passes through with the flow in self cleaning fashion. And being smaller means you can fit many times more bio filtration in your sump space. I've even used small amounts of sealer to glue them together as a platform to raise my skimmer. Awesome product.

Very good

Order so I could put Bio-Blocks in my marine tank sump an take out the live rock so I could make room for other equipment. Working brilliant no nitrates in tank.

Seems well made, although hard to tell how well it課ｪs working. I can believe the surface area is huge by the structure of this stuff. Very expensive though!

Only time will tell