Grind Size for South Indian Filter Coffee

The Kaapiswada family · 2026-10-22

The right grind size for South Indian filter coffee is fine, about like fine rava with a little powder mixed in. That is fine enough to give a dark, slow-dripping decoction, and coarse enough that the water can still pass through the steel filter without choking it.

If your decoction keeps coming out thin, or the filter drips for an hour, the grind is often the reason. Here is how we think about the grind size for South Indian filter coffee, what to do if you grind at home, and how to tell when you have got it right. If you want a ready blend for this, see our Swadamalnad filter coffee. Step by step, see how to make South Indian filter coffee at home.

Why grind size matters in a steel filter

A South Indian filter works by gravity. Hot water sits on a bed of coffee and drips slowly through the holes in the base. The grind decides how fast that happens.

Too coarse: water rushes through, and the decoction is pale and weak.
Too fine: the powder packs into a dense layer, the holes clog and the drip slows to a crawl.
Just right: a steady drip over 15 to 20 minutes and a dark, thick decoction.

Our family has looked after our estate in the Mullayanagiri foothills of Chikmagalur for more than 50 years, and this is the balance we aim for at home.

The grind size for South Indian filter coffee, step by step

Start with whole beans (like Kaapiswada Roastswada: whole Arabica beans from our own Chikmagalur estate) or buy ready-ground filter powder.
Grind in short pulses, not in one long run. A mixie works if you pulse and shake the jar.
Stop when most of the powder looks like fine rava, with some finer dust mixed in.
Use it soon after grinding, because ground coffee loses aroma quickly.

If you do not want to grind at all, a ready filter powder is already ground for a steel filter (like Kaapiswada Swadamalnad: our 80:20 blend made with single-estate Arabica from our own family estate in Chikmagalur).

How to adjust if the drip is wrong

Change only the grind first, then brew again.

Water runs through in a few minutes: the grind is too coarse. Grind a little finer next time.
Almost nothing drips: the grind is too fine, or the powder is pressed too hard. Grind a little coarser and rest the disc lightly.
Decoction is bitter and muddy: very fine dust may be leaking into the cup. Skip the last pulse.

For more on fixing a thin cup, see our guide to a weak filter coffee decoction.

Whole beans or ready powder?

Whole beans let you control the grind and keep the aroma fresh until you grind. Ready powder is quicker and is made for the steel filter. Both give a good cup. You can see the range we make on our products page.

If you want to try it, see our Swadamalnad filter coffee, or look at all our coffees.

If you want to set the grind yourself, our Roastswada whole beans and Pureswada 100% Arabica are the two ways to start.

Questions people ask

Can I use espresso grind in a South Indian filter? Not usually. Espresso grind is much finer and tends to clog the holes. Aim for fine rava with a little powder instead.

Can I use a mixie to grind coffee beans? Yes. Use short pulses and shake the jar between them so the grind stays even. Do not run it continuously, because that makes a fine, uneven powder.

Why does my filter drip so slowly? The most common reasons are a grind that is too fine, powder pressed down hard, or blocked holes. Loosen the powder and clean the holes. Our guide to using and cleaning a South Indian coffee filter shows how to unblock the holes.

Does the grind change for chicory blends? Chicory is already ground fine in a blend, so ready blends are made to suit a steel filter. If you grind your own beans, aim for the same fine rava texture.