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What machine are you using? All of the machines I am familiar with have a humidifier that adds water to the air. You fill the humidifier with distilled water. I am not sure what type of filter would add the moisture to the air. All of the machines I am familiar with have a filter at the air intake.
Example on the M series machines they have a small grey rectangle that is foam. You wash the filter as needed, allowing it to completely dry before reinserting it in the slot. It is important that the filter is completely dry as you do NOT want any moisture to get inside your machine as it will cause it to malfunction.
Who supplied your machine? They should have went over the various components of the machine with you when you received it, explaining as they went. Although I do know there are some members have had their machines drop shipped to the DME.
Tell which machine, the full name, it should be written on it somewhere. Only then we can give your more specific help.
As far as the pins and needles feeling, you body is probably low on oxygen due to your sleep apnea.
pins and needle are a sign of lack of B12
What meds are you taking?? There are those meds, metronidazole for one, that can cause peripheral neuropathy, and it can be permanent if the metronidazole isn't stopped immediatly.
Your legs giving way trying to walk upstairs, plus the pins and needles in your arms and hands sound most like 02 deprivation tho. Do you have a lung problem? Are you a smoker? Allergies? Asthma? I would want at least an in-office spirometry, if not a full PFT, if you have any daytime shortness of breath on mild exercise, etc.
Do you have any history of MS in your family?
Do you have the humidifier that goes with your particular machine. Water needs to be added to the water tank in order for it to produce the humidity. I am unsure why they gave you the filter to provide moisture as the google search I did on it provide no information on its uses with a cpap machine. It did talk about its use on a ventilator, oxygen, etc. I wouldn't think it would provide a continuous source of moisture for a year using it nightly for 8 hours or so but the way it appears to look on the website. Ask about the humidifier for your machine, if you don't already have it.
It should have the water tank in front like the front picture if it has the humidifier already. The water tank should be clear and hold your water. If it came with this, add distilled water. It should have the ambient tracking to help prevent rainout. If it doesn't have the intergrated heated humidifier with your machine, ask them to supply it.
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