A Closer Look: Plastic Strainer


Today we are going to take a closer look at the plastic strainer.  These plastic strainers are one of my favorite tools for making both milk and water kefir. They easily catch the grains and fit over a wide-mouth mason jar lid with just a bit of overhang.

Why I Like Them

Because there is no metal involved, I don’t have to worry about the acids in these beverages reacting with the metal, leaching, or damaging the grains at all. Once I’ve strained the water kefir grains through this strainer and added them to a fresh batch of sugar water, I like to use this strainer to juice lemons and limes through to catch the seeds. This allows me to use one tool for straining the water kefir grains and then flavoring them with delicious fresh citrus juices.

Product Highlights

Perfect for straining kefir and kombucha. High-quality plastic with nylon-mesh strainer. Dishwasher-safe. Two sizes available. BPA-free (handle plastic type PP). Progressus Brand. Made in Italy.



Product Reviews

Review by Alex: Works great for water kefir. The milk kefir tends to clot. I’d like to see a sieve with a larger mesh for milk kefir straining.

Review by Carole: I got the larger strainer which fits perfectly on my 2 cup liquid measuring cup. The smaller one I think would fit perfectly on a mason jar? I may order one of those in the future. I imagine if I had driven all over town maybe all over Central Florida I may have found one locally…but my time is precious and just to be able to order it here and so reasonably priced. Thank you for having the supplies.

Read more product reviews on the product page.

Product Q&A

From Bernie

Q. Do I need a plastic strainer for kiefer grains? Can I use a metal strainer?
A. It is best to avoid metal with kefir grains. The only metal that CAN be used is stainless steel, but typically the holes in a stainless steel strainer will be too large to catch the small kefir grains.


Q. The size of 2-1/2″ or 3-1/2″ refers to the diameter or radius? Thanks!
A. This measurement is for the inside diameter of each strainer.

From Andee

Q. Is it recommended to designate a separate strainer for kombucha, and another for kefir? Or is just one okay?
A. While a separate strainer for each product is more convenient and lowers the risk of cross-contamination between fermenting products, as long as you clean it thoroughly between uses, a single strainer should be fine.


Shannon is a mama to four small children, homesteader, freelance writer, and picture-taker. She lives with her husband on their off-grid homestead where they make and eat kefir, kombucha, sourdough, and fermented vegetables.

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  1. says

    Hi. I have my plastic strainer for my water kefir (I’m not sure I like water kefir yet and am just getting started). I’m not sure what it’s supposed to taste like. My first couple batches I put into a second ferment with a touch of cranberry juice and it only got to tasting like watery cranberry juice.

    But anyway…for other things, what do you use to skim the top of things in wide mouth Mason jars? Does a little strainer with a small grid exist? I’m thinking of my beet kvass that got the start of white stuff on top. Or a fermented pepper batch that got the same.

    Help with a gadget!

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