The complete guide
How To Choose A Sink Strainer That Actually Fits
The problem nobody thinks about until it is too late
A blocked kitchen drain is one of those jobs that always lands at the worst moment. The sink fills, the water does not move, and you end up on your knees with a bucket and a wrench under the cupboard, pulling apart a pipe trap full of grey sludge.
Here is the thing. That sludge is not mysterious. It is rice, pasta, coffee grounds, tea leaves, onion skins, flecks of egg shell and, in the bathroom, hair. Every single one of those things went down the plughole because there was nothing in the way to stop it.
A fine mesh drain strainer is the thing in the way. It costs very little, takes no installation, and intercepts the debris while it is still dry enough to tip into a bin. Once you have used one for a month you stop noticing it, which is exactly how a good bit of kitchen hardware should behave.
How a mesh strainer works
The design is simple on purpose. A shallow metal basket with a fine mesh floor sits in the plughole. The rim is wider than the hole, so it rests on the lip around the drain. The body drops into the opening and holds itself in place against the flow of water.
Water goes through the mesh. Solids do not. That is the whole mechanism.
The reason a fine mesh matters, rather than a few big punched holes, is scale. Big holes catch potato peel. They do nothing about the rice grains and coffee grounds that actually build the clog. A proper fine mesh sink sieve catches the small stuff, and the small stuff is what causes the trouble.
The second reason is hair. In a bathroom basin, hair is the main problem, and hair slips through anything with gaps wider than a couple of millimetres. A fine mesh holds it on the surface where you can see it and pick it off.
The measurements that decide everything
This is the part people skip, and it is the only part that really matters when you are buying.
A sink strainer is not a one size fits all product. There are three numbers that have to work together.
Outer diameter. This one is 70 mm. It is the width of the rim that sits on your sink surface. It needs to be wider than the hole so the strainer does not fall in.
Inner diameter of your drain. This version is built for openings of 42 mm. That is the size of the actual hole in your sink. Measure straight across the widest point of the opening, not across the decorative ring around it.
Depth. The basket drops 9.5 mm into the drain. If the recess in your plughole is shallower than that, the basket will not seat and will sit up proud of the sink, where it rocks and gets knocked out of place.
Grab a ruler or a tape measure and take those two readings from your own sink before you order anything. Thirty seconds of measuring avoids the most common reason people return a strainer. If your drain opening comes out at 52 mm or your recess is 20 mm deep, this is not your size, and that is useful to know in advance.
Why the metal matters
A sink strainer lives in water. Not occasionally, but constantly. That rules out a lot of materials.
These baskets are made from polished metal in SS201 quality. Two properties matter. It does not rust, so it will not leave orange marks in a white sink or weaken at the seams after a few months. And it does not react to acids or alkalis in cleaning agents, which means your dish soap, your citrus cleaner and your weekly sink scrub will not degrade it.
Plastic strainers are cheaper, but they stain, they go brittle in hot water, and the thin ones crack at the rim. Chrome plated versions look fine until the plating lifts. A solid stainless steel sink strainer just keeps being a stainless steel sink strainer.
The polished finish is a small bonus. Because the strainer sits in the middle of your sink where everyone sees it, a bright finish blends into a steel sink far better than a dull or discoloured one.
Who this suits
Households that cook properly. If you rinse rice, drain pasta, scrape plates and wash vegetables, your drain is taking a steady load of solids every day. A kitchen plughole filter is the single cheapest piece of prevention available.
Anyone with long hair in the house. Bathroom basins and shower drains clog almost entirely from hair. A drain hair catcher sitting in the basin turns a yearly plumbing job into a ten second weekly task.
Renters. You are not drilling anything or modifying the plumbing. The strainer drops in and lifts out, and it comes with you when you move.
Keeping solids out is more important, not less.
Anyone fitting out a new place. Three in a pack covers a kitchen, a bathroom and a laundry sink, which is most of a small home sorted in one order.
Keeping it clean
This is not demanding. After washing up, lift the basket, tip the contents straight into the bin or the compost caddy, and give it a rinse under the tap. Put it back. That is the daily routine and it takes about five seconds.
Every week or two, the mesh benefits from a proper clean. Grease and fine particles build a film that slows drainage. A soft brush and a drop of dish soap clears it. Or just drop the basket into the dishwasher with the next load, since these are dishwasher safe.
Two things to avoid. Do not attack the mesh with steel wool, because it scratches the polish and can distort the fine wires. And do not leave a full basket sitting for days, because wet food residue smells and attracts flies far faster than the same scraps in a closed bin.
If you ever need to clear a build up from the mesh itself, a soak in warm water with a little white vinegar loosens most of it without any scrubbing.
Making the most of three
A three pack is not just spares. Spread them around.
Put the hardest working one in the kitchen sink. Put a second in whichever bathroom basin collects the most hair. The third can go in the laundry sink, an outdoor sink, or stay in the drawer as the clean swap while the kitchen one is in the dishwasher.
That rotation is genuinely handy. You never have a sink sitting unprotected just because the strainer is mid wash.
What a strainer will not fix
Worth being straight about this. A mesh strainer catches solids. It does not catch grease.
Hot fat and oil pour through the mesh as a liquid, then cool and solidify on the walls of the pipe, where they trap everything else. If you regularly pour cooking fat down the sink, a strainer alone will not keep the drain clear.
The fix is simple. Wipe greasy pans with a paper towel before washing, and pour cooled fat into a jar for the bin. Do that alongside using the strainer and your pipes stay genuinely clear.
The short version
A sink strainer is one of the few household items where the cheap version and the right version are the same thing, as long as you get the size right.
Measure your drain opening. If it is around 42 mm across with a recess of at least 9.5 mm, this 70 mm fine mesh set drops straight in. The metal resists rust, cleaning products will not harm it, and it goes in the dishwasher when it needs it.
Three in a box means you can cover the kitchen, the bathroom and one more drain at once. After that, the only thing you have to do is tip it into the bin and rinse it, which is a much better deal than taking apart a pipe trap on a Sunday afternoon.