Adding beneficial bacteria periodically to a water feature is one of the most important maintenance aspects to maintain clear, healthy water. It is recommended to dose your pond year-round to ensure strong colonies of nitrifying organisms. Some biological water treatments are formulated for all-season use, but some are mixed for optimal performance in the winter, spring, summer and fall.
If you want to maximize the potential of your biological filtration in your water garden, make sure you have your biological filter boxes filled with high-surface area media. Biological media is a material that bacteria cling to and grow on; the greater the surface area, the greater the colonies.
For string algae control see IonMate™ Electronic Algae Control System from Complete Aquatics.