Ratio coffee filters
Find the right filter for every Ratio coffee maker we list: 4 brewers and 0 original filters.
By coffee maker
| Model | Original filter | FLTR PUR |
|---|---|---|
| Eight (original, pre-2024) | Chemex FS-100 bonded squares | Wholesale only · made to order |
| Eight Series 2 | Universal 8–12 cup basket | Wholesale only8–12 Cup Basket Coffee Filters (Bunn 20106 Style) |
| Four | Universal 4–6 cup (junior) basket | Wholesale only · made to order |
| Six | Universal 8–12 cup basket | Wholesale only8–12 Cup Basket Coffee Filters (Bunn 20106 Style) |
Questions and answers
What filters do Ratio coffee makers use?
Across the 2 Ratio brewers confirmed against the manufacturer, the most common filters are: Universal 8–12 cup basket (8½ × 3¼ in): 2 brewers.
Does FLTR PUR make filters for Ratio brewers?
Yes: 8–12 Cup Basket Coffee Filters (Bunn 20106 Style). Each brewer page shows which one fits.
How do I find the filter for my Ratio model?
Find your model in the list on this page; each brewer page shows the exact filter part number, its size and the compatible FLTR PUR filter. The model name is usually on a label on the back or underside of the brewer.
Can’t find your brewer? Measure your filter.
- A · Flat diameter: lay one filter flat and measure edge to edge.
- B · Base: measure across the flat bottom of a formed filter.
- C · Wall height: measure the fluted side from base to rim.
Send us your size
Brand names are trademarks of their respective owners, used only to identify compatibility. FLTR PUR is not affiliated with or endorsed by these manufacturers.