Mattolaituri can be translated as carpet-washing pier. It is a tradition in Finland to wash carpets, especially the ubiquitous rag rugs in lakes, rivers or the sea, usually with tall oil soap, in the summer.
The practice is a bit controversial as the detergents are water pollutants. Myself, I’ve washed my carpets on the floor of the laundry room in my apartment building, but I as a kid I was often with my mom or grandma when they were washing carpets in a river.
In the bonus picture, a carpet press and beams for letting the carpets dry can be seen. The press cuts the drying time significantly.
Tall oil is a by-product of chemical pulping, along with turpentine. Tall is Swedish for pine. In the dominant kraft pulp process, the non-volatile resin and fatty acids of wood (especially pine or birch) form crude tall oil soap with the cooking chemicals (white liquor) and the soaps can be separated from the spent cooking liquor (black liquor), purified and the fatty acids used for making soap.
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