Forum · Purified Water Vs Distilled Water for CPAP?

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[-] IndependentLavenderMonkey3724 +1 point · about 1 year ago

Is there a problem using purified water versus Distilled water? Thanks,

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[-] DanM +2 points · about 1 year ago Sleep Commentator

Hi @IndependentLavenderMoney3724. I cannot say if there is a problem with purified water versus distilled water. Both are basically water that has been treated in one manner or the other to remove impurities. We generally recommend distilled water because CPAP manufacturers make the recommendation for distilled water in their documentation. In the absence of distilled water, I have seen recommendations for purified bottled water.

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[-] wiredgeorge +1 point · about 1 year ago Sleep Commentator

I would definitely use distilled water. Purified water has minerals which leave deposits as it evaporates while these have been removed from distilled water. If you use purified water, over time, you will have mineral build up.

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[-] KindLavenderClam5181 +0 points · 6 months ago

I will be in Mexico for two months longer and have, after a week of looking, been unable to find a good supply of distilled water. They only seem to sell tiny bottles and only in pharmacies. Also, the pharmacies that are nearby only keep a couple bottles in stock. My internet research indicates that water produced by the reverse-osmosis method is, in fact, distilled water. Apparently, there are various methods of producing distilled water and reverse-osmosis is one of them. 'Purified water' may or may not be produced by reverse-osmosis. My plan is to go shopping for 'purified' water and attempt to determine if the purification process used was reverse-osmosis. Also, distilled water, here, is available in auto supply stores for use in lead-acid batteries. I don't trust that water at all and will use common bottled water, if that is the only option. Comments?

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[-] wiredgeorge +0 points · 6 months ago Sleep Commentator

As water evaporates; especially if heated out of a CPAP reservoir, if it has minerals, the minerals will be left behind. I suspect some will also accumulate in the innards of your CPAP machine. The RO isn't as effective at pulling out minerals as most are rated at 90-99.5 percent effective as distilled water. The main issue with an RO unit as its filtering efficiency degrades as the filters process more water volume. An RO system also has better filtering ability with more stages. Simple RO systems can have 3 stages but a high-end system can have 5 stages plus UV to kill bacteria.

I don't know anything about the distilled water in the local Mexican autoparts stores but if you don't trust it, certainly distilled water which has ZERO minerals, while being a better choice than RO but can't be found, well the RO water is probably OK. I suggest you buy a spare reservoir or two (they are about $20 for a Resmed reservoir). You might want to soak your reservoir in a vinegar solution in the event you are using tap water to clean it to kill bacteria and germs. now and again.

You can also google making distilled water; looks like a bit of a pain but it can be done by a home do-it-yourselfer. not sure if you want to drop $200 but you can get a countertop water distilling set up that is fairly compact on amazon.

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[-] ac555 +0 points · 6 months ago

I've been in a similar situation. You will be fine using it, but as Wiredgeorge said it will leave minerals behind in the headed reservoir. Essentially, it's just going to be like a white powder that's stuck on the bottom of the tank, and is a pain to clean off. Purified water is not going to hurt you, it's just going to be annoying to clean.

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