Someone gave me a couple of these plus three spare sets of the balls you put inside them. I just used them for my cleaning cloths and occasionally sheets that need only a light wash. I put a bit of FC in when doing the sheets but I.m not sure if this affects their efficiency.
Does anyone use these? I got some free with our our washing machine about two years ago. I put them at the back of the cupboard thinking they'd be rubbish but if they do really do 150 washes for £10 then that might be a good saving.