When pond water enters UV clarifier and runs past the UV-C bulb, the UV light destroys the algae.
Dead algae is removed by filtration.
Click thumbnail for larger view GreenFree for crystal clear viewing pleasure. Clarifies heavy algae bloom in less than five days, and prevents recurrence. Delivers full power from bulb for one year with the Philips UV-C bulb. Reduces maintenance for a beautiful pond. Complements the water garden- compact, durable and attractive.