IMS Shower Screen And Filter Baskets

If your shots channel, taste uneven, or never quite repeat, the basket and shower screen are where the fix often starts. IMS makes precision-punched filter baskets and integrated-membrane shower screens for most 58mm, 53mm and group-specific machines on the market. This is the upgrade angle: better hole geometry, more even water distribution, more consistent extraction. Below, the full IMS range, plus how to choose the right precision basket for your machine.

What the holes actually do

A filter basket's job is to let water leave the puck evenly. The difference between a stamped supermarket basket and an IMS one is the punching. IMS perforation is exclusive and patented, with the perforated area sized in proportion to the basket shape. On the BIG BANG pattern that's 497 holes across a ø44mm area, with incremental spacing from 1.5mm that increases toward the edge. More open, more uniform area means lower, more even flow resistance, which is what reduces channelling.

Membrane shower screens

IMS competition shower screens carry an integrated membrane created directly inside the shower body and fixed by caulking, so there's no separate blocking disc to lose or clog. Filtering capacity runs from a fine 35µm wire-membrane up to the 200µm integrated-membrane screens, depending on group. The Nano Quartz coated MA200 adds a non-stick surface that resists limescale and spreads water more evenly over time.

Fit before upgrade

The single most common mistake we see is ordering on dose alone. Group diameter, body diameter for your tamper, and ridge profile all have to match. A B70 2T basket for a 58mm La Marzocco group is a different part from a B62.5 basket built for a 53mm tamper. Check the group first, dose second.

Choosing the right IMS basket or screen

IMS makes two things this page covers: precision filter baskets and shower screens. The decision tree is short, but you have to start in the right place.

Step one: match the group, not the dose

Every IMS basket is built to a group standard. The B70 family (ø70mm border) fits 58mm groups across Astoria CMA, Bezzera, BFC, Brasilia, Casadio, Conti, ECM, Elektra, Expobar, Faema, Fiorenzato, Grimac, La Marzocco, Nuova Simonelli, La Pavoni, Rancilio, Sanremo, Slayer, Synesso and Vibiemme. The B62.5 BIG BANG family is built around a ø54mm body for ø53/53.4mm tampers. The B68 family sits at ø68mm. Order the family your group takes before you look at anything else.

Step two: pick your dose band

Ridgeless baskets seat slightly differently to ridged ones and pair well with a bottomless portafilter for diagnosing channelling.

Step three: the shower screen above it

A precision basket works best under an even shower. If your screen is pitted, scaled or clogged, replace it. IMS integrated-membrane screens (200µm) and fine wire-membrane screens (35µm) are group-specific. The MA200 fits La Marzocco, Synesso and Slayer; the RA200 suits Rancilio, La Pavoni and Bezzera; E61-format screens fit E61 groups. The Nano Quartz MA200 is worth it in hard-water areas.

What to pair it with

A new basket exposes distribution errors a worn one hid, so a WDT tool and a bottomless portafilter earn their keep here. For replacement screens by machine rather than by brand, our shower screens spare-parts category lists parts by group. We've tested this gear behind the counter and stock the consumables that go with it.

A precision basket is one piece of the extraction chain. To get the full benefit, pair your IMS basket with a bottomless portafilter so you can see channelling, a WDT tool to break up clumps before tamping, and a fresh shower screen so water arrives evenly. A puck screen on top keeps the IMS screen cleaner between backflushes. Dialled in, that combination is where consistent, repeatable shots come from, not from any single part on its own.

I'll be straight with you: a basket swap is the cheapest meaningful upgrade in espresso. For the price of a couple of bags of beans, an IMS basket fixes problems people spend hundreds chasing elsewhere. Scott Rao built half his teaching on what uniform basket punching does to extraction, and once you've pulled a shot through a good one you feel it. We've been selling these to home setups and busy cafés since 1999, and the advice is the same for both: get the group right, then let the holes do their work.

Frequently Asked Questions