Product review (1 stars): Don't waste your money
If I could give negative stars for this, I would.  These are marketed as cleaning capsules, but the only ingredient is chemicals to prevent hard water build up.  There isn't any anti-bacterial chemicals in them.  Oh, yes, they SAY antibacterial coating on the capsules themselves - but that isn't doing anything to prevent your water from building up mold and germs.  My humidifier was a breeze to clean from the hard water build up stand point, but there was tons of mold and germs because this product wasn't doing the job.