Hey guys, does anybody know of the best type/material of water line/hosing to use for pumping R/O water? Would it be the polyethylene?
Thanks!
Thanks!
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Non-Corrosive R/O Lines
- Thread starter amannamedtruth
- Start date
what makes you think your RO water is corrosive?
pvc would be my suggestion, owing to cost.
pvc would be my suggestion, owing to cost.
It's highly corrosive to copper pipes. I think my lines are made from polyethelene.
PE is food grade plastic I believe.
actually high EC water accelerates corrosion more so than low EC water.
are you sure you are not referring do the permeate from an ro membrane? its widely known that permeate flows are especially corrosion prone, ESPECIALLY with salt water ro plants... where the permeate is approaching like 100,000 mS/cm^-1.
purified, deionized water is used in heat exchangers and all sorts of processes sensitive to corrosion and scaling. i promise you, if DI/DO or ro water was more corrosive than tap water, they would not be pumping it through equipment costing sums you or i cannot imagine.
are you sure you are not referring do the permeate from an ro membrane? its widely known that permeate flows are especially corrosion prone, ESPECIALLY with salt water ro plants... where the permeate is approaching like 100,000 mS/cm^-1.
purified, deionized water is used in heat exchangers and all sorts of processes sensitive to corrosion and scaling. i promise you, if DI/DO or ro water was more corrosive than tap water, they would not be pumping it through equipment costing sums you or i cannot imagine.
10 second google search
"The problem associated with reverse osmosis produced water is not in the processing, nor in the ability to provide needed quantities of water to supplement current supplies, nor is it in supplying finished water free from toxic contaminants, but it is in supplying finished water which is very corrosive to metal distribution piping. For anyone who does not know, reverse osmosis finished water has a relatively low pH (in the range of 5-6) and little to no alkalinity or hardness to act as a buffer. Thereby, this finished water is quite aggressive on metal distribution piping existing prior to the installation and operation of the RO system"
"The problem associated with reverse osmosis produced water is not in the processing, nor in the ability to provide needed quantities of water to supplement current supplies, nor is it in supplying finished water free from toxic contaminants, but it is in supplying finished water which is very corrosive to metal distribution piping. For anyone who does not know, reverse osmosis finished water has a relatively low pH (in the range of 5-6) and little to no alkalinity or hardness to act as a buffer. Thereby, this finished water is quite aggressive on metal distribution piping existing prior to the installation and operation of the RO system"
interesting. ive never seen ro water with such a low ph personally.
perhaps its due to carbonic acid? i know for boiler feed water, they almost always incorporate a de-airing step, whereby co2 and oxygen are removed to further lower the waters ability to corrode metals.
perhaps its due to carbonic acid? i know for boiler feed water, they almost always incorporate a de-airing step, whereby co2 and oxygen are removed to further lower the waters ability to corrode metals.
RO really shouldn't have a measurable pH because it has no minerals to buffer. I get a reading in the 5's but it drifts.
I'm with queg in my way of thinking,
normal tap has the minerals in it that cause probs.
i'm not saying RO isn't corrosive, this is the 1st time Ive ive heard mention of it.
I'd like to know more on the *why's* of it..
knowledge is power
storing your PH meter in RO water will screw up the glass probe so there's definitely something more to it and if it does that to glass probe its not a stretch it can be corrosive to metal pipe?
ok, alittle reseach and HIH hits the nail on the head with RO's low PH.
The problem associated with reverse osmosis produced water is not in the processing, nor in the ability to provide needed quantities of water to supplement current supplies, nor is it in supplying finished water free from toxic contaminants, but it is in supplying finished water which is very corrosive to metal distribution piping. For anyone who does not know, reverse osmosis finished water has a relatively low pH (in the range of 5-6) and little to no alkalinity or hardness to act as a buffer. Thereby, this finished water is quite aggressive on metal distribution piping existing prior to the installation and operation of the RO system. SeaQuest, manufactured by Aqua Smart, Inc. in Atlanta, Ga. (website:www.aquasmartinc.com) has been successful at controlling this aggressive corrosiveness to metal piping and to tap fixtures (which normally could be sites for increased lead and copper levels exceeding USEPA and WHO standards as well as potentially producing discolored water from general corrosion). The NSF and DWI health certified corrosion control sequesterant, at very low treatment rates, puts down a protective monomolecular coating on metal surfaces after slowly removing all pre-existing corrosion/scale build up. This coating acts as a barrier at the interface between the water/pipe layer, preventing further corrosive deposit buildups. As long as the SeaQuest is constantly fed into the finished water supply, distribution piping is safe from the aggression of RO water supplies.
normal tap has the minerals in it that cause probs.
i'm not saying RO isn't corrosive, this is the 1st time Ive ive heard mention of it.
I'd like to know more on the *why's* of it..
knowledge is power
storing your PH meter in RO water will screw up the glass probe so there's definitely something more to it and if it does that to glass probe its not a stretch it can be corrosive to metal pipe?
ok, alittle reseach and HIH hits the nail on the head with RO's low PH.
The problem associated with reverse osmosis produced water is not in the processing, nor in the ability to provide needed quantities of water to supplement current supplies, nor is it in supplying finished water free from toxic contaminants, but it is in supplying finished water which is very corrosive to metal distribution piping. For anyone who does not know, reverse osmosis finished water has a relatively low pH (in the range of 5-6) and little to no alkalinity or hardness to act as a buffer. Thereby, this finished water is quite aggressive on metal distribution piping existing prior to the installation and operation of the RO system. SeaQuest, manufactured by Aqua Smart, Inc. in Atlanta, Ga. (website:www.aquasmartinc.com) has been successful at controlling this aggressive corrosiveness to metal piping and to tap fixtures (which normally could be sites for increased lead and copper levels exceeding USEPA and WHO standards as well as potentially producing discolored water from general corrosion). The NSF and DWI health certified corrosion control sequesterant, at very low treatment rates, puts down a protective monomolecular coating on metal surfaces after slowly removing all pre-existing corrosion/scale build up. This coating acts as a barrier at the interface between the water/pipe layer, preventing further corrosive deposit buildups. As long as the SeaQuest is constantly fed into the finished water supply, distribution piping is safe from the aggression of RO water supplies.
I don't know how I know this and it may not be true, you'd have to look it up if you're interested but I want to say it's corrosive properties come from something to do with the electrons or ions reaction to the copper. Copper is a very reactive metal.
This is why when you buy an under the sink RO filter unit it comes with a separate stainless steel faucet and doesn't route thru your normal faucet.
This is why when you buy an under the sink RO filter unit it comes with a separate stainless steel faucet and doesn't route thru your normal faucet.
here's a pic of ROs work on copper.
funny how its doing the visual damage on the elbow that was sweated.
looks like its also working on the brazing material?? what is it?? a lead and tin mix
https://search.yahoo.com/search;_yl...ss&fr2=sa-gp-search&fr=ssb-uh-t1&type=2button
funny how its doing the visual damage on the elbow that was sweated.
looks like its also working on the brazing material?? what is it?? a lead and tin mix
https://search.yahoo.com/search;_yl...ss&fr2=sa-gp-search&fr=ssb-uh-t1&type=2button
true, copper is especially corrosion prone. this is because of its reduction potential.
keep in mind tho... alloys of copper used in most plumbing applicaitons are pretty good at resisting corrosion.
acidic water will however, slowly run off with the passivation layer of any copper pipe.
keep in mind tho, thats only with constant water flowing through the pipe. if one were to leave some amount of ro water sitting in the pipe, it would not slowly eat its way though the pipe like in the aliens movie.
keep in mind tho... alloys of copper used in most plumbing applicaitons are pretty good at resisting corrosion.
acidic water will however, slowly run off with the passivation layer of any copper pipe.
keep in mind tho, thats only with constant water flowing through the pipe. if one were to leave some amount of ro water sitting in the pipe, it would not slowly eat its way though the pipe like in the aliens movie.
storing your PH meter in RO water will screw up the glass probe so there's definitely something more to it and if it does that to glass probe its not a stretch it can be corrosive to metal pipe?
ro water ruins ph probes because the osmotic pressure basically causes all the ionic reference electrolyte to run out of the glass membrane. by storing it in buffer or storage solution, this flow of reference electrolyte is slowed way down, or stopped completely.
if what he is saying about ro water being 5ph is true, i completely understand the corrosion potential. low ph depending on the metals reduction potential, can greatly accelerate corrosion.
especially when this is a nonstop process, as with a desalinating plant.
but have you guys observed such a low ph from an RO unit?
i ran an ro unit for a year or two, before i knew better. i never saw a ph below 6 ever.
perhaps some other RO membranes, besides the common TFP membranes, are especially prone to this, tho i suspect its more to do with the water to begin with.
can you fix the image in your link? its just a yahoo.com search link far as i can tell. i waited some time already hoping you would notice the error = ).
im interesting to see what you are referring to. Im not surprised to hear that a brazed joint would suffer from corrosion tho.
btw, how does one edit his or her own post on this particular forum?
try it now,
I couldn't link to a specific pic for some reason, here's the page its on
https://images.search.yahoo.com/sea...-uh-t1&va=reverse+osmosis+water+corrosiveness
to edit if you can, look at your post above
there should be 3 functions available at the bottom right hand corner of the box for you..
edit---quote---quick reply... edit should be the 1st
btw
you need 50 posts to be able to use many of IC mags functions
I couldn't link to a specific pic for some reason, here's the page its on
https://images.search.yahoo.com/sea...-uh-t1&va=reverse+osmosis+water+corrosiveness
to edit if you can, look at your post above
there should be 3 functions available at the bottom right hand corner of the box for you..
edit---quote---quick reply... edit should be the 1st
btw
you need 50 posts to be able to use many of IC mags functions
