I have Wellos and Biocera. My helper is using them randomly. I have no idea which one was used in every wash. My opinion is the outcome of them are not too much different (maybe useless). However, Biocera has a bad smell itself after wash even I dry it under the sun for a whole day.
As I found some of our cloths are not clean enough after wash which was easy to be removed by washing powder before. I have asked my helper to wash with these laundry balls together next time. I will give them up if no improvement.
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