If you have liquid soap in a bottle, would squeezing it out on Shabbat be an act of melacha (sechita)? Would using a pump dispenser instead be sechita?
Sechita is a term that derives from the labor category of dash, threshing. The technical definition is "removing a product from its natural container." This therefore includes:
- Removing a wheat kernel from its husk
- Squeezing grapes for juice
- Milking a cow
And somewhat differently,
- Wringing out a wet rag. Apparently water absorbed into a porous material is treated like a natural container.
The soap dispenser is non-porous, and soap has no "natural" container. Therefore it's allowed.