PocketStrainer FAQ
Everything you need to know about catching, collecting, and analyzing your kidney stone with PocketStrainer.
What is PocketStrainer and what is it for?
PocketStrainer is a collapsible urine strainer for catching kidney stones and fragments at home, so you can save your stone for lab analysis. It replaces the bulky, disposable strainer the hospital hands out — folding flat to just 3/8 inch so it fits discreetly in a pocket or bag.
How do I use it?
Place the funnel over your toilet or a collection cup and urinate through it. The fine mesh catches any stones or fragments while liquid passes through. Check the mesh after each use, then rinse and reuse. See our full instructions for step-by-step guidance.
Will it catch small stones and fragments?
Yes. The 40-mesh (400-micron) 316 stainless steel screen captures small calculi and sediment, so you can collect even tiny fragments for analysis.
Is it reusable, and how do I clean it?
It is fully reusable. Rinse it by hand or run it through the dishwasher — the 316 stainless steel and BPA-free silicone resist corrosion and won't crack like cheap plastic.
How discreet and portable is it?
It folds flat to about 3/8 inch — roughly the thickness of a few stacked coins — so it slips into a pocket, purse, or bag without announcing what it is for.
Is PocketStrainer FDA approved?
PocketStrainer is an FDA-listed Class I medical device, made in an FDA-registered facility. FDA registration and listing are not the same as FDA approval or endorsement — the FDA does not "approve" low-risk Class I devices like this one.
What is it made of?
A BPA-free, food-grade medical silicone funnel bonded to a 316 stainless steel mesh — the corrosion-resistant grade most strainers skip in favor of cheaper 304 steel or nylon.
Where can I buy it, and how much does it cost?
You can buy PocketStrainer on Amazon (4.6★ from 121 reviews), Walmart, or direct from this site. The 1-Pack is $14.99, with a 2-Pack available at a per-unit discount. See our Where to Buy page for links.
Is there a guarantee?
Yes — every PocketStrainer is backed by a 30-day money-back guarantee.
