In a pinch, you can use a paper coffee filter as most people have them lying around the house and are super cheap, they're not perfect but they are around 20 microns. If you want to go for a more industrial size, synthetic sieves will probably outlast your stainless steel options as no matter how much rinsing, your stainless steel will probably rust and potentially contaminate your cultures.
Just my two cents. You can even use reusable coffee filters that are plastic, I think they're even from the dollar store that are a larger mesh than 20 microns.
I've looked at offering sieves along with our products at reefsolutions.ca but have not pulled the trigger yet. All in due time I guess!
Hope that helps in the meantime!
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