Fernox Powerflow Flux is a soft, white paste that promotes rapid, reliable wetting of capillary joints for copper plumbing systems. It’s easy to apply, helps remove light oxides during heat-up, and delivers clean, strong soldered joints with either leaded or lead-free solder. Critically, Powerflow Flux is WRAS-approved and suitable for potable water applications when used as directed—ensure residues are wiped off and the system is thoroughly flushed after completion.