Open algae pond systems are exposed to air, which gives them several natural advantages. To start with, these ponds are typically much less expensive to build and maintain. In a closed system, you’ll likely need to run a CO2 system to ensure that the algae receive enough carbon dioxide, but in an open system, the algae will be able to get it from the surface. Open systems also typically make use of natural sunlight rather than artificial light. The only power you’ll need to use will be for pumps to fill or drain the pond, your harvesting equipment, if used, and for a circulation device that continuously mixes water so that the algae receive even exposure to air, nutrients and sunlight.
There are some disadvantages to these systems, the most notable of which is that contamination from the environment or even animals is a bigger risk. These systems also produce less algae per liter of water, and they may have an unpleasant odor associated with them. You will find open algae systems in the form of ponds, raceways, and tanks. Flexible liners such as those offered by BTL Liners can be used to line any of these structures for a cost-effective and leak-proof containment system.
