I just got an RO water filter. Does back pressure on the wastewater and pure water lines effect production? How can I optimize this?
PoE Purity if Essence
I just got an RO water filter. Does back pressure on the wastewater and pure water lines effect production? How can I optimize this?
only DISTILLING cleanses water and leaves only water
A properly functioning RO system provides better purification than distillation.
Power over Ethernet.
Is that the whole thing?? Where's you're sediment and carbon pre-filters? You'll plug up your membrane right quick without those. Chlorine destroys most membranes.
Ditch the tank. Without some fancy valving, tanks create backpressure on the purified water outlet, reducing the pressure differential across the membrane. Just fill those 3-gallon stackable jugs Walmart sells for $10.
Also, tanks can get biofilm on the inside.
Also, when starting the system, let it run for 15 seconds to allow it to purge any crap and build proper pressure differential across the membrane. In the 'off' state, the membrane will allow impurities across because the pressure equalizes when not in use.
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>Also, when starting the system, let it run for 15 seconds to allow it to purge any crap and build proper pressure differential across the membrane. In the 'off' state, the membrane will allow impurities across because the pressure equalizes when not in use.
Why do impurities get blocked when the unit is operating then cross when there is no pressure difference or flow?
>Why do impurities get blocked when the unit is operating then cross when there is no pressure difference or flow?
Probably because that guy has no idea what he's on about. He's saying to remove the pressure tank, when, in a normal RO setup, you have to have one unless you want to wait (literally) 10 minutes to fill a single glass of water. Some water dispensers can work without the tank (those that are designed to expect low flow from their filter cartridges), but it's required if you're hooking it up to a faucet.
An RO membrane is also flat-out impermeable to anything much larger than a water molecule. That is the entire basis on which they function on the first place. In what world would such a membrane allow contaminants across when there's _less_ pressure trying to force them through? That would also require the outlet always be open and draining water, which is plain moronic no matter how you look at it.
> probably because he doesn't know what he's saying
I worked at a reverse osmosis manufacturer that did major innovations in them through direct research.
You can take your pomposity from your overpriced engineering degree, with concomitent lack of actual experience, and shove it up your ass. You have my permission.
Imagine a thousand layers of nylon window screen. If they are floating around in a medium - water - and you gently move water from one side of your chamber to the other, impurities will get through.
If you now compress the sheets of screen together, by having a 70psi high side and a no-psi low side, the pressure differential compresses the screen and what comes out is much higher in purity.
Same goes true with pumped RO systems. Commercial ones increase the membrane inlet pressure, with a pump, and route some of the reject water back to the pump inlet, increasing production and decreasing waste water brine. Higher purity and less waste.
>If you now compress the sheets of screen together, by having a 70psi high side and a no-psi low side, the pressure differential compresses the screen and what comes out is much higher in purity.
No it doesn't. Squeezing screens together doesn't reduce the mesh size, and that's not how reverse osmosis filters are structured anyway. The osmotic membrane is a thin solid film (typically nylon a fraction of a micrometer thick), which is mechanically supported by some thicker porous material which does not filter anything but instead holds the osmotic membrane in place as water flows through it.
PrepHole was having issues yday. So I'll summarize
> > this is how it works
> no it doesn't
Claiming 'no', then proceeding to be describing how an individual layer of the membrane works.
It's called a visualization aid.
Same as I said.
Source: measuring impurities when pressure is normalized, vs high pressure differential, at a high-end RO DI mfg..
It's not like this stuff is secret:
https://en.wikipedia.org/wiki/Thin-film_composite_membrane