The Aqua-Pure 5605859 is the correct replacement ballast for the following UV systems:
The Aqua-Pure 5605859 Replacement UV Ballast fits the APUV1, APUV2, APUV5, and APUV 8 UV filter systems from Aqua-Pure and provides constant UV output over a wide range of input voltages or frequencies. The APUV1 ballast runs smoothly, creates less heat, and handles power supply variances without shutting down your system. This replacement UV ballast features open-loop current control and is a genuine Aqua-Pure replacement part.
Aqua-Pure 5605859 Replacement UV Ballast specifications: