Caribsea Ocean Direct 40lbThis substrate is different than all other live sand products on the market. Ocean Direct utilizes Sea Breathe technology, which preserves real live sand with its own original bacteria. Every breathable bag of Ocean Direct is alive with up to 1000 times more beneficial bacteria than other preservation methods. Every grain of Ocean Direct is coated with bacteria and encapsulated by capillary action in a thin film of real ocean water. The thin film is