only 10 pieces of Bio-Spheres/ 1 Bio-Block / 40 pieces of Bio-Cubelets, can replace up to 20lbs (10kgs) of live rocks.

For Bio-Blocks, simply place them directly in your sump or area with high water flow. Putting all Nano-Tech Bio-Sphere in a mesh bag makes it easy to maintenance and save huge place for other equipment. It can be used in both fresh water and seawater environment.

For Bio-Cubelets, can be used directly in main tank, or in sump, different types of filters including canister filters, hang-on back filters, etc.

The Bio-Media should be cleaned or replaced every 6 months for optimal results. However, when cleaning/replacing old Bio-Media, DO NOT clean/replace all of them at the same time.

Clean/replace half of the Bio-Media such that there are sufficient bacterial colonies remaining to reestablish themselves in the newly cleaned/replaced Bio-Media.