They work great. I didn't think my old ones were bad. They were about 2 years old, used in semi-damp rooms and just left in the garage when not in use. Plugged it in and immediately noticed a huge surge in ozone. I use it to eliminate odors. Noticed a big improvement in odor reduction compared to my old ones. I didn't want to buy new ones, but I'm glad! They appear to be of equal or better quality than the ones that came with my Phoreozon machine.
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