Blagdon pro uvc have been designed for larger pondsr there are four models within this range and any number of units can be connected together via optional wide bore link pipes allowing you to expand the system for future expansion to meet your changing needsr why use uv systemsr uv helps improves a fishes chances in fighting bacterial diseases or even parasitic diseases such as ichr uv sterilization is effective for controlling suspended algae green water in ponds along with proper fi