The greenstop pro series of uvcs from pondxpert are aimed at serious pondkeepers who wants a professional bit of kit at a very competitive price. The pondxpert greenstop pro 55w incorporates several simple, but important, features which help to protect the units and vastly improve water clarification.pond uvc clarifiers are designed to kill algae by binding algae particles together to remove them from the pond. Clarifiers can also kill harmful bacteria to prevent fish diseases. By including the turbulator, the greenstop pro units can remove more algae and bacteria than other 55w uvcs, making your pond healthier.in built uvc this clarifier includes a built in 55w uvc functionality, keeping your pond clean and clear for the long term!uvc bulb included.thermal protection auto off feature the greenstop pro clarifiers include an advanced thermal protection feature, which turns the pump off should it ever get close to overheating. This provides valuable protection for your equipment!turbulator these clarifiers incorporate a helix design around the bulb, which increases the duration of the uv exposure as the water goes through the unit. This results in a much clearer pond compared to traditional uv clarifiers.flow adjuster the greenstop pro units include a flow adjuster that can be installed into the unit, giving you control over your flow rate.