I have two 400 micron bags that I use in my Anvil Foundry as well, one for dark beers and one for light. After rinsing them off I throw them in the washing machine with a little PBW instead of regular detergent and they have lasted for six years without issues. The dark beer one is stained dark and the light one still looks brand new. As long as you use it in the malt pipe you shouldn’t have any problems. Cheers!
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