Step 1: See confirmed spreadsheet size guide sheet here
Step 2: Printable measuring cut outs for best sizing here: <<<
Step 3 Ask us :) Send Email Brent@goodbrotherscoffee.com
Chemex Standard vs (909) Lab Papers:
Chemex Filters: The most common option. These allow a faster flow rate compared to no filter, so you’ll need to grind a bit finer to maintain proper extraction.
909 Lab Filters: Much finer and slower—these can slow espresso extraction and improve clarity (like the chemex) by providing finer filtration. You will need to grind much courser compared to not using a paper at all. Cant decide? Get both :)
Chemex filters are hand cut:
Oxygen cleansed which is a bleach-free process, ensuring no chemical residue or taste is imparted to the filter.
Compostable and biodegradable.
Manufactured in the USA and uses only USA materials; responsibly harvested and conforming to SFI, FSC, and PEFC sustainable programs.
909 Lab fitlers are hand cut:
Ahlstrom Grade 909 qualitative cellulose paper with ~3 µm nominal retention and medium flow for finer particle capture
Wet-strengthened with a small, insoluble resin for durability when saturated; ideal for consistent, uniform filtration.
Certified for food contact per [specify standard, e.g. U.S. FDA, EU 10/2011, etc
If sizing does not fit properly let us know. We will replace or refund.
We now have Ahlstrom Qualitative 909 Filter Paper for most sizes. Check the drop down.
Want another size? let us know!
Size A (55 mm) - Most 58mm baskets e.g: Decent.
Size B (46.7 mm) - La Pavoni, Some Breville IMS, Normcore 58mm,
Size C - (50.8 mm) Some Breville IMS basket,
Size D - (53 mm) La Marzocco, VST 22 Gram, Breville Oracle Touch Stock
Size E - (37 mm) Flair Pro 2 Basket
Size F - (56.5 mm) Big Bang IMS 58 + 14 gram Ascaso Stock + Meticulous
Size G (45mm) Breville 54 Stock Basket / Crema Bottomless / La Pavoni 49mm (pre Millennium
Size H (53.5mm) Top of 54mm Baskets + Bottom Nurri, Vostok,ACS Evo Leva
Size J (58.5mm) Top of 58mm Baskets + Sworks Billet Basket 58 (also in 909) Also Fits Weber Unibasket.
Size K (63.5mm) Aeropress Filters + Oxo Rapid Brewer Top Paper
Size M (38.5mm) Flair Signature/ Neo / Classic
Size O (57.5mm) Scott Rao Filter 3.0 Basket / Oxo Rapid Brewer Bottom
Size P (49.7mm) Strietman CT1 & CT Top filter
Size Q (48.75mm) Sworks Step Down Bottom
Size R (47.5mm)
Size S (32mm) Sworks Convex
Size T (30mm)
Size U (27mm)
Size V (73mm)
See size guide sheet here Or use our printable measuring cut outshere: Any issues or questions at all just let us know Brent@goodbrotherscoffee.com
"PortaPaper" filters are designed for multiple size baskets. These are hand cut from Chemex filters and produce:
Higher clarity out of your espresso shots
Reduces "spray" from bottomless portafilters. Less mess!
liberates all of the filter’s pores for coffee to flow through more evenly.
Used to keep group head & puck screen clean
Possible Health Benefits:
May reduce Cholesterol according to study found here:
Porta Papers can be used at the top of the basket along with the bottom of the basket. This will require different size papers for top and bottom. For the top of 58mm is size J. For the top of 54mm baskets use size size H
