5 gallon bucket. Hot water 50% filled. Cup of bleach.
Take filter socks, rinse really good, inside out as well.
Then while inside out I Soak for 3 hours in bleach water.
I Take it out, rinse very well. Pull it back to normal layout.
Soak for 2-3 hours. Take out and rinse again.
Sometimes soak in warm water if any smell to it.
The next day I rinse again before use.
been doing it like that for 3 years