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#51
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Keith Hughes wrote in news:46e62c2e$0$10300
: Depends on whether your still is really effective or not. If you're only condensing *steam*, i.e. not water vapor but gaseous steam, you may be correct. However, unless your still is a multi-effect (doubtful) or uses some form of cyclonic separation (doubtful), and uses some form of demisting (also doubtful), you don't have quite the assurance you think you do. Almost certainly any organisms will be inactivated, but you may still have endotoxin carryover. There is no water vapor making its way out of the water trap in the top of the boiler. Water doesn't run well uphill with no pressure. There's a special trap in the top to prevent it. I've never heard of endotoxin vaporizing only the various ...enes like benzene, xylene, all carbon- based that are trapped by the activated carbon filter the water coming out passes ever so slowly through so these distillable petroleum products attach themselves. You can easily taste these in the un-carbon-treated distilled water. The taste is significantly different after carbon filtration. Another sign is my water will not conduct electricity, even at 2000 volts from my megger. Distilled water is an insulator uncontaminated. ONE grain of table salt just touching the water on the other side of a container of it and ZOOM!....The current goes WAY up! I cannot get my polycarbonate containers to get the TDS below about 1.9 ppm. I think the containers themselves are being eaten by the really corrosive distilled water, which causes a tiny leakage in the electrical test. RO water has its place. But, there ARE bad problems with RO if it is not meticulously maintained. And, it takes a lab test to see if it's safe boaters don't have, placing WAY TOO MUCH FAITH in the integrity of that membrane, I think. Larry -- Search youtube for "Depleted Uranium" The ultimate dirty bomb...... |
#52
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#53
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Jere Lull wrote in news:2007091120440443658-
jerelull@maccom: As I understand him from the past, the viruses are broken down to toxic chemicals that will pass. The bacteria, not viruses, contain the toxins that make you sick. The toxins are as small or smaller than the water molecules....and flow through as soon as the bacteria are crushed by the pressure as they deteriorate from the flow and pressures. Are there viruses as small as H2O? Yes, there are.... Larry -- Search youtube for "Depleted Uranium" The ultimate dirty bomb...... |
#54
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Jere Lull wrote in news:2007091120440443658-
jerelull@maccom: You say that viruses are smaller than sodium or chloride ions? I got A's in college chemistry, and I have trouble believing it. http://en.wikipedia.org/wiki/Image:W...dimensions.svg http://stinet.dtic.mil/oai/oai? &verb=getRecord&metadataPrefix=html&identifier=AD0 735750 See. I think the chart on this RO-promotion website is very telling.... http://www.freedrinkingwater.com/rejection.htm It says RO passes the pollutants test from NSF 58 on the left column and REDUCES/rejects the pollutants on the right column. Reduces? It doesn't say HOW MUCH it reduces. I find this omission on lots of "charts" like this one telling me we're not hearing the full story. http://www.pwgazette.com/tfc.htm Here's a "partial list" that does show the percentages..... 94-96% of arsenic. How much arsenic should we drink? 95-98% of the radioactivity. I hope there's no radioactivity in your seawater, but there is. Again, is this too much? 99% of the viruses. Will 1% of the herpes viruses in my glass give me herpes? YES IT WILL...just like the 3% of the radium will cause cancer in laboratory humans. RO is a FILTER, that lets a fair percentage of the bad stuff flow through. These numbers come from an RO company. Are they higher than reality in an RO system with a 3-year-old membrane that's been running on a boat filtering seawater? I'd suspect they'd be quite optimistic numbers on an older membrane..... Larry -- Search youtube for "Depleted Uranium" The ultimate dirty bomb...... |
#55
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#56
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![]() "Larry" wrote in message ... I quoted it all so you can re-read it. I was referring to those nasty water filters on all the water-based drinking equipment at any restaurant on the coke machine, coffee pots, tea making equipment... The filters fill up with crap the first week that sit against the filter medium deteriorating into whatever pressure does to them.....LONG before anyone ever changes them because they are totally clogged....yecch. Case in point is the filter behind anyone's refridgerator that feeds the ice machine. When was the last time it was changed? 1992??!! At least SOME RO operators will flush out the big stuff...sometimes. Larry -- Search youtube for "Depleted Uranium" The ultimate dirty bomb...... Larry, the metal filters in coffemakers can be cleaned (and should be, once a month or so) with plain white distilled vinegar. Dunno if this also applies to the other machines you mention. |
#57
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![]() Larry wrote: Keith Hughes wrote in news:46e62c2e$0$10300 : Depends on whether your still is really effective or not. If you're only condensing *steam*, i.e. not water vapor but gaseous steam, you may be correct. However, unless your still is a multi-effect (doubtful) or uses some form of cyclonic separation (doubtful), and uses some form of demisting (also doubtful), you don't have quite the assurance you think you do. Almost certainly any organisms will be inactivated, but you may still have endotoxin carryover. There is no water vapor making its way out of the water trap in the top of the boiler. Water doesn't run well uphill with no pressure. Water vapor runs 'uphill' very efficiently, since it weighs much less than air (ever see a cloud?). Water vapor - what you can actually see - is not steam, it's water. And that vapor can carryover all kinds of things if not removed. There's a special trap in the top to prevent it. That's the point I was making - a simple demister like your still likely has is not nearly as efficient as you may think it is. Hence the use of cyclonic separators in many (depending on design) industrial stills, to remove vapor and low molecular contaminants more effectively without a huge hit on distillation efficiency. I've never heard of endotoxin vaporizing only the various...enes like benzene, xylene, all carbon- It doesn't vaporize, it becomes entrained in the water vapor. based that are trapped by the activated carbon filter the water coming out passes ever so slowly through so these distillable petroleum products attach themselves. You can easily taste these in the un-carbon-treated distilled water. The taste is significantly different after carbon filtration. Another sign is my water will not conduct electricity, even at 2000 volts from my megger. Distilled water is an insulator uncontaminated. I think you'll find that distilled water (unless it's distilled in glass) will have a resistivity of about 2 megohms/cm, versus DI water at ~18 megohms/cm. There's more than enough ions released by the stainless to drop the resistivity (increase conductivity) significantly when compared to DI water. ONE grain of table salt just touching the water on the other side of a container of it and ZOOM!....The current goes WAY up! I cannot get my polycarbonate containers to get the TDS below about 1.9 ppm. I think the containers themselves are being eaten by the really corrosive distilled water, which causes a tiny leakage in the electrical test. RO water has its place. But, there ARE bad problems with RO if it is not meticulously maintained. And, it takes a lab test to see if it's safe boaters don't have, placing WAY TOO MUCH FAITH in the integrity of that membrane, I think. You say that like everyone is feeding wastewater into their RO. With simple maintenance, they can be very effective, and very safe, especially when you're talking about desalinization. But take a look at commercial (real) stills and look at the performance specs. Check Stilmas, Steris/Finn-Aqua, Mueller, etc. You'll find that they will provide a 3-log reduction of endotoxins, and they will not effect a significant reduction in over TOC, so you can't dump sewage in a still and be assured of pristine pure water coming out. Yes you *can* do that with distillation, but you have to accept a 10 or 20 fold reduction in efficiency to ensure that absolutely *no* vapor is carried over. That doesn't sell well. I'm not saying that your still is not effective, and not a good way to make clean water. It's just not nearly as effective and foolproof as you want to claim. Keith Hughes |
#58
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On Wed, 12 Sep 2007 02:48:17 +0000, Larry wrote:
And, it takes a lab test to see if it's safe boaters don't have, placing WAY TOO MUCH FAITH in the integrity of that membrane, I think. There is a simple test for chlorides: just add a drop of silver nitrate solution to a sample. Any hint of cloudiness would indicate a leak. This is how the steamship boys tested their boiler water for leaks in the condenser. Your conductivity test should also find a hole in the membrane. I also think there are many who would not bother to check: you may be right about 'too much faith'. Lots of people simply trust the stuff to be good, when they fill up with whatever comes out of the hose at the marina. It wouldn't be that hard to add a conductivity meter to the RO equipment at the factory. How often do the membranes fail, anyway? Casady |
#59
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Keith Hughes wrote in news:46e77321$0$3576
: With simple maintenance, they can be very effective, and very safe, especially when you're talking about desalinization. Now, all we have to do is get the busy lawyer, who can't replace batteries in a flashlight twice in a row resulting in a usable flashlight, to do this maintenance....in his busy life chasing money. It doesn't happen on our docks. It would happen on a boat owned by a hermit, bored to tears out there on the hook. The hermit has plenty of time to do boat maintenance, some their only reason for living. Larry -- I've watched a lawyer fixing a head. It would be hilarious to watch him fixing a complex RO system!...(c; |
#60
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On Wed, 12 Sep 2007 03:31:14 +0000, Larry wrote:
The test is the TDS meter and electrical conductivity. Distilled water is an insulator. These carbon-based chemicals you list attach themselves very nicely to the carbon molecules in the activated carbon filter. That filter gets quite hot in their presence during use, even at the tiny trickle of water coming from a small distiller. Gasoline is an insulator. Conductivity tests only detect ions. Hydrocarbons do not ionize and are really good insulators. They fill transformers that operate at hundreds of thousands of volts, with oil. By the way, there is no such thing as a carbon molecule. Casady |
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