A couple of posts back I got some unusual results (compared to contemporary brews) from a Hario V60 02 dripper with a CBI style, drip brew method. I only had Chemex filter papers handy & I wondered whether the paper, or the V60 dripper was responsible for the wider deviation in extractions with that method, compared to Kalitta Wave, Westmark 2-hole plastic (Melitta style) brewer & a Bonavita Immersion dripper (the latter used as a pourover brewer, rather than as an immersion brewer).
It is important to remember that any of these brewers can produce consistent cups with good technique & dialling in. For the purposes of this test however, I was more keen to see how the brewers & papers behaved with a very consistent, but basic technique, with no changes, nor dialling in from the previous tests.
All filter papers were bleached white variants, the V60 papers were made in Japan.
10 brews for each brewer & paper combination were carried out, 40 brews in total. These 40 brews had an average extraction yield of 18.6% and a SDev. of 1.49%EY, the 40 brews spanned a 5.7% range of extraction yields (15.7% to 21.4%).
Chemex & Chemex paper/V60 & Chemex paper vs. V60 & V60 paper/Chemex & V60 paper: showed no significant difference as being due to the paper used, in neither time (p=0.259), nor extraction yield (p=0.097).
Chemex paper & Chemex/V60 paper & Chemex vs. Chemex paper & V60/V60 paper & V60: showed a significant difference in both time (p=0.000) & extraction yield (p=0.003). So it looks like the brewer makes a bigger difference than the paper filter used.
Running an ANOVA on the 4 brewer & paper combinations showed that there was a difference in both brew time & extraction yield.
Further investigation showed no significant difference in extraction yield between V60 with Hario paper, V60 with Chemex paper, or Chemex with Chemex paper. F(2,27)=0.909, p=0.415.
Chemex with V60 paper did show a difference in extraction yield when run over all 4 conditions. F(3,36)=5.960, p=0.002. Note that the Chemex 3-6 cup can brew small amounts with a V60 paper. However, larger brews may see the paper filter & coffee bed slump into the spout’s groove. This will choke the brew, so something in the spout to allow displacement of air in the brewer may be necessary (I have a steel drinking straw that fits nicely).
Hario V60 brewer with Chemex papers, or V60 papers: Whilst there was no difference between the Hario V60 brewer with either paper, in terms of extraction yield (p=0.743), there was a difference in brew time (p=0.000) with the Hario paper taking, on average 18 seconds less to hit the same EY. The V60 brewer did, however, show a lower SDev. (1.10%EY) with the Chemex paper than with the V60 paper (SDev. 1.43%EY).
Chemex brewer with Chemex papers, or V60 papers: There was no significant difference in brew time between Chemex with Hario paper & Chemex with Chemex paper (p=0.768), but there was a difference in extraction yield (p=0.029). The Hario paper in the Chemex brewer resulted in the highest & most consistent extractions (average 20.0%EY, SDev. 0.95%) compared to Chemex paper (18.6%EY, SDev. 1.57%).
Chemex paper with V60, or Chemex brewers: There was no significant difference in extraction yield (p=0.239), but there was a difference in brew time (p=0.000), with the V60 brewer & Chemex paper taking 28 seconds less on average, to hit a similar extraction. The V60 brewer did, however, show a lower SDev. (1.10%EY) than the Chemex brewer with the same paper (SDev. 1.57%EY).
Hario V60 paper with V60, or Chemex brewers: Again this showed the V60 paper & Chemex brewer combination to be able to achieve a higher (20%EY, versus 18%EY for the Hario brewer) & more consistent extraction yield (0.95%SDev, versus 1.45% SDev for the Hario brewer), whilst stretching out brew time by an average of 48 seconds.
Whilst the brew method used, in itself might not follow popular methods, it does seem to reinforce the need to pour in a controlled manner & not allow a large body of liquid to sit above the bed for the Hario V60 with either paper, or the Chemex brewer with Chemex paper.
This test, along with another I conducted with a Bartlett 3-hole (Melitta style) truncated cone, also seems to reinforce Peter Guiliano & Thompson Owens’ observations, that the truncated cone brewers, with a single small drainage hole (Bonmac, Melitta, Bonavita) are able to extract well with a more basic, fill & forget type technique. The Kalita Wave also seems to fall in this category, despite having 3 holes (the holes in my steel 185 version are much smaller than the drainage holes in the other brewers).
My take-aways from this are:
- Use a goose-neck pouring kettle with drip brewers that have a large and/or numerous drainage holes. Pulse pouring and/or grind adjustments to control flow are more critical for these brewers in order to maintain target extractions.
- The Kalita Wave & Chemex 3-6 cup, with V60 paper, can produce ‘gold cup’ & consistent extractions with a regular kitchen kettle. As can the truncated cone brewers with a single, or maybe two, small drainage hole(s).
Purely subjectively, the Chemex brewer & Chemex paper combination achieved the lowest average preferences in this test, but in fairness none of the 4 combinations tested here hit my typical preference, in the context of this experiment.