Mgtf04

I would PM the supplier and get their feedback. Maybe they know or have experience of what other buyers do.
Surely someone on here has experience with this?
Personally I would just replace any underlay with a modern material anyways. I used aqua filter material one time due t9 it’s qualities and carbon impregnating to kill off smells. Worked a treat and water dissipates with the form and make up of the material.