That’s how my Miele washing machine works and I love it.
You put two large detergent containers in (one for whites and one for colours) and then forget about them. The machine reminds you when you’re running low and allows you to reorder more thru the app.
I have no idea if it’s cheaper or not, but anecdotally they feel like they last a long time. Ultimately, I don’t care, because of the convenience and the fact I know the machine is working out the correct dose per wash (the machine has a touchscreen interface that allows you to state what’s in the wash: T-shirts, denim, towels, etc. the level of soiling, etc. Then it works out the temperature, duration, drying time, and correct detergent type and dosage)
You put two large detergent containers in (one for whites and one for colours) and then forget about them. The machine reminds you when you’re running low and allows you to reorder more thru the app.
I have no idea if it’s cheaper or not, but anecdotally they feel like they last a long time. Ultimately, I don’t care, because of the convenience and the fact I know the machine is working out the correct dose per wash (the machine has a touchscreen interface that allows you to state what’s in the wash: T-shirts, denim, towels, etc. the level of soiling, etc. Then it works out the temperature, duration, drying time, and correct detergent type and dosage)