How to Use a Breville Barista Express Accessories: A Practical Guide

You just pulled a shot that looked gorgeous, but it tasted sour. You adjusted the grind, but now it’s bitter. The machine is capable of so much more, but the box of accessories that came with it feels more like a puzzle than a toolkit. Most home baristas only use the dual-wall basket that ships pre-installed and never touch the rest of the kit. That is a waste, because the Breville Barista Express accessories are not just spare parts—they are the difference between a mediocre latte and a cafe-quality shot.

This guide covers the practical side of using those accessories. You will learn which basket to use for which coffee, how to use the razor tool correctly, why the cleaning kit matters, and how to get the most out of your water filter. No vague tips. The steps below are effective, derived from testing the BES870XL and similar models. You’ll also see a side-by-side comparison of the stock accessories versus the upgrades worth buying.

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Before we dive into the parts, there is one accessory that rarely gets attention but affects every single shot: the water filter. The stock filter works, but it wears out faster than you think. The Possiave 12-Pack Water Filters are a direct replacement for the Breville BWF100. They fit the BES870XL, BES860XL, BES920XL, and most other Breville models. The coconut shell charcoal removes chlorine and off-flavors that make espresso taste flat. Since you get twelve filters in one pack, you won’t be caught without a fresh one when the change reminder hits.

Which Basket Should You Actually Use?

The Barista Express comes with four baskets: single-wall single, single-wall double, dual-wall single, and dual-wall double. Most people never swap them. That’s a mistake.

Use the single-wall baskets when you are using freshly roasted, high-quality coffee beans. These baskets let water flow through the coffee freely. The extraction is determined by your grind size and dose. That means you have full control, but also full responsibility. If your shot runs too fast, grind finer. If it drips, grind coarser.

Use the dual-wall baskets when you are using pre-ground coffee, stale beans, or coffee from a grocery store. The dual wall creates extra pressure inside the basket. This artificially builds crema and slows down the flow. It compensates for coffee that doesn’t have enough natural CO2. The trade-off is that the shot will never taste as complex as a properly dialed-in single-wall shot.

Here is the rule of thumb: if your beans were roasted more than three weeks ago, use the dual-wall. If they were roasted within the last two weeks, use the single-wall. For a deeper breakdown of the machine’s quirks, check our Barista Express review where we tested both basket types under the same grind setting.

The Razor Tool: Not Just a Fancy Paperclip

The Razor tool is the flat, metal blade with a handle that sits in the accessory tray. It looks like a trimming tool, and that’s exactly what it is. After you grind coffee into the portafilter, it is usually overfilled. The Razor levels the coffee bed to the exact depth the basket was designed for.

Here is how to use it correctly. Grind into the portafilter. Do not tamp yet. Take the Razor and scrape it across the top of the basket, using the two flat edges on the sides as a guide. The blade should sit flush against the rim of the basket. This removes the excess coffee. Now, tamp. You should have about 2mm of headspace between the coffee and the top of the basket.

If you skip the Razor, you will likely overfill the basket. That causes the shower screen to press into the coffee puck before brewing. The result is channeling, where water finds a path through a weak spot in the puck, leading to sour and bitter flavors in the same cup. The Razor takes five seconds to use and removes the guesswork.

One thing to note: the Razor does not replace a proper distribution tool. It only levels the top. For even extraction, you still need to tap the portafilter to settle the grounds before tamping. But for a stock accessory, it does its job well.

How to Use a Breville Barista Express Accessories Kit for Cleaning

The cleaning kit includes a rubber disc, a small Allen key, and a cleaning tablet. Most people use it once and then forget about it. That is a mistake, especially if you drink coffee daily.

The rubber disc and tablet are for backflushing. This process cleans the three-way solenoid valve and the group head. Here is the simple version of the routine. Remove the basket from the portafilter. Place the rubber disc inside the portafilter. Put the cleaning tablet on top of the disc. Lock the portafilter into the group head. Press the two-cup button and let water run for about 10 seconds. Stop it. Let it sit for 30 seconds. Repeat this cycle two or three times. Then remove the portafilter and rinse everything thoroughly. Run a blank shot with no coffee to flush the system.

Do this every 200 shots or once a month, whichever comes first. If you skip it, the machine will eventually develop a slow flow, and you will notice the pressure gauge reading lower than usual. If that happens, you might be dealing with a clogged group head. Our guide on Breville cleaning cycle issues covers troubleshooting when the backflush routine fails.

The Allen key is for removing the shower screen. You should take the screen off once a month and soak it in a solution of hot water and a drop of dish soap. The screen collects coffee oils that the backflush does not fully remove. A clean screen means even water distribution across the puck.

Water Filter: The Silent Ingredient

Your water makes up more than 98% of your espresso. The filter is not optional. The Barista Express has a water hardness setting that you must program based on your local water. The machine comes with a test strip. Use it. If the strip shows hard water, set the machine to the appropriate level. This tells the machine when to alert you to descale.

The filter itself sits in the water tank. To replace it, remove the filter holder from the tank, twist the old filter off, and twist a new one on. Run a cup of water through the tank to prime the new filter. The Possiave filters are individually packed, which helps because a spare filter stays sealed and clean while the other one is in use.

Replace the filter every two months or after 60 liters of water. If you notice a mineral taste in your water, change it sooner. A clogged filter slows the water flow and can cause the pump to work harder. That is a common cause of the pressure gauge reading high while the shot runs slow. For more on that, see our piece on pressure gauge troubleshooting.

Comparison: Stock Accessories vs. Useful Upgrades

Not every accessory in the box is worth using daily, and some upgrades are worth the money. Here is a practical comparison based on what we actually use in testing.

The table shows the stock kit is good enough to learn on, but two upgrades change the experience. A naked portafilter lets you see channeling in real time. A better tamper gives you a consistent tamp pressure every time. The rest of the kit is fine as-is.

Common Questions About Breville Barista Express Accessories

How often should I change the water filter?

Every two months or after 60 liters of water. If you live in an area with hard water, check it monthly. The machine will not tell you when to change it; you have to track it yourself. Mark a calendar reminder.

Can I use the dual-wall basket with fresh beans?

You can, but you will not get the flavor the beans are capable of. The dual-wall basket creates extra pressure that masks the coffee’s natural sweetness. Use it only for pre-ground or stale coffee. Fresh beans need the single-wall basket to shine.

Why does my portafilter have a plastic insert?

That is the dual-wall basket. Breville ships the machine with it installed because most beginners use pre-ground coffee. Remove it and switch to the single-wall basket when you start grinding fresh beans. The plastic insert is not a defect.

Do I need to backflush every time I use the machine?

No. That would be overkill and would strip the oils from the group head. Backflush once a month or every 200 shots. In between, just wipe the group head with a dry cloth after brewing. A quick rinse with water is enough.

What is the metal disc with a hole in the cleaning kit?

That is the rubber disc used for backflushing. It creates a seal in the portafilter so water and cleaning solution are forced through the group head’s internal valves. Do not use it with coffee. It is only for cleaning cycles.

Final Thoughts on Getting the Most From Your Kit

The accessories in the box are not filler. They are the tools you need to control extraction, clean the machine, and keep the water quality consistent. The catch is knowing which one to use and when.

• Use the single-wall basket for fresh beans; dual-wall only for pre-ground or stale coffee.
• Level your dose with the Razor tool before tamping to avoid channeling.
• Backflush with the rubber disc and tablet once a month to keep the group head clean.
• Remove and soak the shower screen monthly using the Allen key.
• Replace the water filter every two months; a multi-pack like Possiave makes this easier.
• Skip the tamper upgrade until you have mastered the stock one; the plastic tamper is fine for learning.
• If the pressure gauge reads high but the shot runs slow, check the water filter first.

Using the full kit takes an extra minute per day and about fifteen minutes per month. That time pays off in a cleaner machine, more consistent shots, and fewer wasted bags of coffee beans. The machine is capable; the accessories are the lever.