Hello all,

I want to filter our washing machine waste via a 1 micron bag filter to remove as many microplastics before it leaves our washroom.

Problem:
Bag filter housing only able to accept water at a max temp of 38c (stainless housing is too expensive).
I’d like to cool the washing machine effluent with a thermostatic mixer valve to bring the temp down below 38c (when for instance we’re occasionally washing at 60c or very occasionally a 90c drum clean cycle).

Questions:
How do I not knacker the washing machine pump – can I add an inline pump to help it out?
Do I need to add a NRV so mains pressure water doesn’t flow back to the washer?

Any help much appreciated

Cheers