Your ballast regulates the electrical flow within your UV system. Damaged or faulty ballasts may result in UV failure or short circuiting.
Replacement ballast assembly for the Pondmaster Submersible UV Clarifier.
Replacement ballast for UV sterilizers. SMALL fits ZP-05 and ZP-10 UV sterilizers LARGE fits ZP-20 and ZP-40 UV sterilizers