I installed a Katadyn 40 on my Endurance 37 for a voyage from South Africa to New Zealand via Panama.
To be honest, I was disappointed. When it worked, it worked well but it is extremely susceptible to any air ingress so installation and pipework joins are paramount i.e. essential to ensure NO air gets into the system. Despite a full onboard service and replacement of all seals I still could not get it to work after it failed halfway between Balboa and the Marquesas.
I gave up after that....