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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

Greywater plumbing
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Hi,

I would not add an inline filter as it will clog quickly and create lots of back pressure. I don’t have an answer for you, apologies. I wonder if there is some sort of filter that could go into a laundry sink so the water can free flow from the washer into it, then drain into the sink. It would have to hold a lot of the laundry water so this may not be practical.

I’m sure you’ve already thought of this, but you could try and move to natural fibers in clothing to avoid making more microplastics.

Best,

Laura

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Great initiative! Cooling the washing machine effluent before filtration is a smart move. Using a thermostatic mixing valve should help maintain the water temperature below 38°C, protecting your filter. As for the washing machine pump, adding an inline pump could assist in maintaining flow, but ensure it’s rated for the temperature and pressure to avoid damage. Regarding the non-return valve (NRV), it’s advisable to install one to prevent backflow into the washing machine, which could lead to issues. Best of luck with your setup!

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