RO Waste water safe to drink?
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sign guy
Active Member
yes it is safer and more pure water I asked someone to test there unit and they had a ppm of 219 going into the unit. after filtration there ppm was 0 the rejected line was at 98 much cleaner than 219. I know that my unit is old and the filters need to be changed. so if what notsonoob is correct my unit should have a higher ppm at my rejection line than anywhere else
wattsupdoc
Active Member
NO, I wouldn't drink it. ....What exactly are the TDS that make it past the chem/mech. filters? Possibly mercury????? If the TDS is only 98 after the filters, how do you know what those are. Odviously, a stronger dose of something that is safe in smaller amounts could be unhealthy. I mean say the water coming in only has a Mercury content of.02% (just throwing that out there), but after the filters thers still .2%. Thats a big difference. ...Soooo... how do you know whats left?
alix2.0
Active Member
Originally Posted by NOTSONOOB
I would say that anybody can drink whatever they want.
If he thinks you are wrong for doing so, that is his opinion. If you are offended...so what.
i wasnt offended. i understood and agreed with what he was saying. i wouldnt make my dogs drink water if i though it was dangerous.
I would say that anybody can drink whatever they want.
If he thinks you are wrong for doing so, that is his opinion. If you are offended...so what.
i wasnt offended. i understood and agreed with what he was saying. i wouldnt make my dogs drink water if i though it was dangerous.
wattsupdoc
Active Member
Originally Posted by sign guy
because its not a smart filter it will only reject what it cant hanndle no on has yet to prove why the tfc would only allow water and not collect trace ellements
What I meant was how do you know what is left after the mech/chem filtration? This would, IMO, be the deciding factor if it is safe. Say that a certian DS was safe at a concentration of .0001 %, but after the RO filter did it's thing and filtered those out, then backwashed itself, there would be a higher concentration of that item. So you might be getting a dose of it at .001%. 10 times higher. After drinking that for say a week, then your body would have had a much higher concentration of that. Soooo.....how do you know, consistantly, that you are not slowly poisoning yourself? Because you dont know consistantly what your getting. There's no debate that the water from the filters, before the RO rejects it is better than the water before its filtered. Drink all you want. The rejected water has a lower concentration of TDS, yes, but the filters removed an uncertain amount of these. Then what ever was left over becomes more concentrated, in the rejected water.
because its not a smart filter it will only reject what it cant hanndle no on has yet to prove why the tfc would only allow water and not collect trace ellements
What I meant was how do you know what is left after the mech/chem filtration? This would, IMO, be the deciding factor if it is safe. Say that a certian DS was safe at a concentration of .0001 %, but after the RO filter did it's thing and filtered those out, then backwashed itself, there would be a higher concentration of that item. So you might be getting a dose of it at .001%. 10 times higher. After drinking that for say a week, then your body would have had a much higher concentration of that. Soooo.....how do you know, consistantly, that you are not slowly poisoning yourself? Because you dont know consistantly what your getting. There's no debate that the water from the filters, before the RO rejects it is better than the water before its filtered. Drink all you want. The rejected water has a lower concentration of TDS, yes, but the filters removed an uncertain amount of these. Then what ever was left over becomes more concentrated, in the rejected water.
wattsupdoc
Active Member
Originally Posted by alix2.0
i wasnt offended. i understood and agreed with what he was saying. i wouldnt make my dogs drink water if i though it was dangerous.
Thank you Alix2.0
i wasnt offended. i understood and agreed with what he was saying. i wouldnt make my dogs drink water if i though it was dangerous.
sign guy
Active Member
Originally Posted by wattsupdoc
What I meant was how do you know what is left after the mech/chem filtration? This would, IMO, be the deciding factor if it is safe. Say that a certian DS was safe at a concentration of .0001 %, but after the RO filter did it's thing and filtered those out, then backwashed itself, there would be a higher concentration of that item. So you might be getting a dose of it at .001%. 10 times higher. After drinking that for say a week, then your body would have had a much higher concentration of that. Soooo.....how do you know, consistantly, that you are not slowly poisoning yourself? Because you dont know consistantly what your getting. There's no debate that the water from the filters, before the RO rejects it is better than the water before its filtered. Drink all you want. The rejected water has a lower concentration of TDS, yes, but the filters removed an uncertain amount of these. Then what ever was left over becomes more concentrated, in the rejected water.
heres my thing. its not concentrated it cant be or the filters would be doing one of two things
1 backflush witch is known to ruin a tfc membrane
2 the tfc would have to choose the water it cleaned. you cant say that the tfc is allowing water only to enter or we would never have to change or filters.
I am more than shure that notsonoob knows alot more about water filtration than I but the way he/she is explaining it is imposible
What I meant was how do you know what is left after the mech/chem filtration? This would, IMO, be the deciding factor if it is safe. Say that a certian DS was safe at a concentration of .0001 %, but after the RO filter did it's thing and filtered those out, then backwashed itself, there would be a higher concentration of that item. So you might be getting a dose of it at .001%. 10 times higher. After drinking that for say a week, then your body would have had a much higher concentration of that. Soooo.....how do you know, consistantly, that you are not slowly poisoning yourself? Because you dont know consistantly what your getting. There's no debate that the water from the filters, before the RO rejects it is better than the water before its filtered. Drink all you want. The rejected water has a lower concentration of TDS, yes, but the filters removed an uncertain amount of these. Then what ever was left over becomes more concentrated, in the rejected water.
heres my thing. its not concentrated it cant be or the filters would be doing one of two things
1 backflush witch is known to ruin a tfc membrane
2 the tfc would have to choose the water it cleaned. you cant say that the tfc is allowing water only to enter or we would never have to change or filters.
I am more than shure that notsonoob knows alot more about water filtration than I but the way he/she is explaining it is imposible
wattsupdoc
Active Member
Originally Posted by sign guy
heres my thing. its not concentrated it cant be or the filters would be doing one of two things
1 backflush witch is known to ruin a tfc membrane
2 the tfc would have to choose the water it cleaned. you cant say that the tfc is allowing water only to enter or we would never have to change or filters.
I am more than shure that notsonoob knows alot more about water filtration than I but the way he/she is explaining it is imposible
How exactly then does the membrane sort the TDS out of the H2O? Does the membranecollect it? I dont think it does. Or does the membrane only allow H2O molecules through? The thing is, where do these TDS that dont make it through the membrane go? In the rejected water is the only logical conclusion. So if the TDS doesnt just dissapear, they have to go somewhere. They will be accumulted in some fashion in the rejected water. The term rejected IMO is not exactly correct in that it's not water that the membrane say "no cant use that water, but this here I can". It is a matter of pressure. When the correct amount of pressure is reached(probably a balanced issue). Then the unit, not necessarily the mebrane, says kicks some out and flush me. The pressure becomes increased/decreased by the amount of TDS collected in the unit. The more TDS, the denser the water becomes.
I dunno, just some ramblings there from the voices in my head that are begining to get outta control.....
heres my thing. its not concentrated it cant be or the filters would be doing one of two things
1 backflush witch is known to ruin a tfc membrane
2 the tfc would have to choose the water it cleaned. you cant say that the tfc is allowing water only to enter or we would never have to change or filters.
I am more than shure that notsonoob knows alot more about water filtration than I but the way he/she is explaining it is imposible
How exactly then does the membrane sort the TDS out of the H2O? Does the membranecollect it? I dont think it does. Or does the membrane only allow H2O molecules through? The thing is, where do these TDS that dont make it through the membrane go? In the rejected water is the only logical conclusion. So if the TDS doesnt just dissapear, they have to go somewhere. They will be accumulted in some fashion in the rejected water. The term rejected IMO is not exactly correct in that it's not water that the membrane say "no cant use that water, but this here I can". It is a matter of pressure. When the correct amount of pressure is reached(probably a balanced issue). Then the unit, not necessarily the mebrane, says kicks some out and flush me. The pressure becomes increased/decreased by the amount of TDS collected in the unit. The more TDS, the denser the water becomes.
I dunno, just some ramblings there from the voices in my head that are begining to get outta control.....
wattsupdoc
Active Member
I have no idea if its correct or not. But why then if the TDS are collected, do we even have waste water?
wattsupdoc
Active Member
I dont quite understand that. You saying that the unit has water pressure pushing at the membrane, but because the membrane can only process x amount of water, any amount of water volume that exceeds that amount is rejected? in order to maintain that pressure on the membrane, the water must continue to flow at it? Why wouldnt the RO have a means to only allow enough water to flow to it that can be processed? Thereby eliminating waste water?
sign guy
Active Member
lets say your house hold water psi is at 70 if you turn your faucet on to the point that your only alowing 75gpd through the faucet thye pressure is only 25psi not nearly enough to push it through the membrane. so we crank it up to push the water through and the water that the tfc cannot procces is discarded
wattsupdoc
Active Member
Closing a valve though prior to the unit would not lower the pressure any, but just the volume of water. The pressure would take longer to accumulate on the membrane. But because the valve is still at least somewhat open, the pressure would eventually build up to the same amount of pressure prior to the valve. Likewise having more pressure than is necessary to push the water through would result in higher amount of waste water. Because the pressure is reached faster than the membrane can process. So if this is the case, and you have excess waste water, closing the valve some would help eliminate waste water correct?
sign guy
Active Member
I stand corrected
two things changed my feeble little mind one beeing a post by doster in my old thread on how to build a rodi
Originally Posted by Dogstar
Ill try...One must first understand that water molecules are smaller than most other types of molecules....
Without any restriction on the waste line, it can not build up pressure inside the chamber that will force the smaller water molecules thru the mesh of the membrane. The mesh is sized just large enough for water molicules to pass thru under pressure. Thus leaveing the larger unwanted particulate molecules that will not fit thru the mesh outside the membrane to be carried away in the waste water.
Look at your own drawing, like its drawn, prefiltered water will freely flow into and out of the chamber....never forceing H2O thru the mesh....picture restriction on the waste line and you can then see how it can build pressure in the chamber that can now force the H2O thru...the rateing on the restrictor determines how much pressure it builds up in the chamber thus controlling the amout that is forced thru the membrane according to its rateing ( the rateing of a membrane is something I dont really understand, Im not saying its a industry gimmick but I do think about that because IMO, its all controld by the restrictor )
BTW, is that two ROs piggybacked together....how did you plumb those ??
the second thing was to call a wholeseller out in calli that help talk me off the ledge so after all that was said and done I think I get the jest of how a tfc ro membrane works. although I still stand by the thorey that with a fairly new tfc you should be fine. therefore each person test for themselves
two things changed my feeble little mind one beeing a post by doster in my old thread on how to build a rodi
Originally Posted by Dogstar
Ill try...One must first understand that water molecules are smaller than most other types of molecules....
Without any restriction on the waste line, it can not build up pressure inside the chamber that will force the smaller water molecules thru the mesh of the membrane. The mesh is sized just large enough for water molicules to pass thru under pressure. Thus leaveing the larger unwanted particulate molecules that will not fit thru the mesh outside the membrane to be carried away in the waste water.
Look at your own drawing, like its drawn, prefiltered water will freely flow into and out of the chamber....never forceing H2O thru the mesh....picture restriction on the waste line and you can then see how it can build pressure in the chamber that can now force the H2O thru...the rateing on the restrictor determines how much pressure it builds up in the chamber thus controlling the amout that is forced thru the membrane according to its rateing ( the rateing of a membrane is something I dont really understand, Im not saying its a industry gimmick but I do think about that because IMO, its all controld by the restrictor )
BTW, is that two ROs piggybacked together....how did you plumb those ??
the second thing was to call a wholeseller out in calli that help talk me off the ledge so after all that was said and done I think I get the jest of how a tfc ro membrane works. although I still stand by the thorey that with a fairly new tfc you should be fine. therefore each person test for themselves