It does its job. I give it 4 stars for the following reason: compared to another more famous brand, these ones only last for two washes. Meaning, although almost everything is single-use, with the other brand I can still use them for about 3 or 4 times occasionally. These ones will definitely gather up on the first use, but on the second, they are already "clogged". It is worth noting that in both products, I put two in each wash.