Description
WLP004 Irish Ale Yeast – PurePitch Next Generation 70 ml
WLP004 comes from one of the oldest stout breweries in the world. The yeast works for many beer styles, but really shines in malty British styles such as stout, porter and brown ale. Medium attenuation gives a dry finish that brings out roasted malt notes. Esters round out the flavour and produce a smooth, drinkable stout. The yeast gives a slight hint of diacetyl, balanced by light fruitiness.
Please note: This product is only available in Norway.
Best before: 22.12.2026
Technical data
- Attenuation: 69–74 %
- Flocculation: medium to high
- Alcohol tolerance: medium (5–10 %)
- Ideal fermentation temperature: 18–20 °C
PurePitch Next Generation
PurePitch Next Generation contains twice as much yeast in a convenient 70 ml pack, to consistently pitch 7.5 million cells/ml. The pack is recommended for 20 litres of standard ale with OG below 1.074 and a temperature above 16 °C, without a starter. Just twist off the top and pitch the yeast.
Frequently asked questions about WLP004 Irish Ale Yeast
What temperature should WLP004 ferment at?
The ideal fermentation temperature is 18–20 °C.
Which beer styles does WLP004 suit?
Irish beers, stout, porter, brown ale and red ale. It can also make an interesting pale ale.
Do I need a yeast starter?
No, not for 20 litres of standard ale with OG below 1.074. For stronger beers or larger batches you need more yeast, for example two packs or a starter.
Does WLP004 produce diacetyl?
A little. The yeast gives a slight hint of diacetyl, which is common in Irish beers. Leave the beer on the yeast until fermentation is completely finished, so the yeast can clean up.
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