Desta: Thanks for mentioning the filters for the concentrators. I have one from Oxydoc that I've used for a few years & very happy with it. I've been doing maintenance on mine & am not able to purchase replacement filters. I carefully washed the existing ones in mild soap & water, dried for 24 hrs. & put them back in the machine. I don't think it'll work to do that a second time. I would also like to purchase filters from Jack.
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