Pegasus Posted January 27, 2003 Author Report Share Posted January 27, 2003 WOW..... Here come the tech boys and I only said that a Sari will apparently filter out.............................. Geez.... Wonder what the Indian ladies would think of all this. We have a great scope of members on this site.... that's for sure Now about this bacteria..... I think that....... he he. Great posts everyone, thanks for the input. Quote Link to comment Share on other sites More sharing options...
Delta Posted January 27, 2003 Report Share Posted January 27, 2003 :lol: :lol: :lol: I'd like to think there was something more than just mechanical filtering going on with the silk. Rather than the silk chargeing the water molecules, could it be chargeing clay particles or something else in the water?? And then the bacteria gets bonded to the clay statically(or electro magnetically???) As the water sits in the pot waiting to be drunk, this stuff settles out along with the muck, leaving cleaner water. The only reason I'm thinking of this is that apparently "Geo Liquid" works like this (with the static) I've been reading up on Geoliquid so this static thing was in my mind when I read Pegasus's post, and silk reminded me of science static experiments and........ my head hurts. cheers Di Quote Link to comment Share on other sites More sharing options...
Midas Posted January 27, 2003 Report Share Posted January 27, 2003 It was found that the polution and harmful bacteria was reduced by over 50% using this method, and the after effects of illness were also reduced. Was there any more detailed info about the results obtained with these silk filters? It is difficult to assess their potential without more detailed info. What specifically were they talking about when they said 'pollution' and 'harmful bacteria'? By pollution were they just meaning suspended solids? If so this is nothing special. Leaving the water to settle for extended periods of time would probably work just as well. On the other hand if it were removing some dissolved compounds, e'g. heavy metals etc, this would be more impressive, but I think this is very unlikely to occur. A 50% reduction in bacterial load is not what I would call good in terms of water treatment. If you have high bacterial numbers initially you will still have high numbers after a 50% reduction e.g. 50% of 100000 cfu/ml is still 50000 cfu/ml. Normally something like 99% reduction would be better i.e. down to 1000 from 100000. Even thats still a lot of bacteria, especially if we are talking about high numbers of faecal coliforms. It would still be unsafe to drink. Quote Link to comment Share on other sites More sharing options...
Pegasus Posted January 27, 2003 Author Report Share Posted January 27, 2003 Ever wondered about something..... Well I did. I wondered if the net had any info, and as Midas asked: Was there any more detailed info about the results obtained with these silk filters? It is difficult to assess their potential without more detailed info. .... I decided to type "Sari Filtration" into my browser. The news article was very brief BTW, and of course didn't give the full story in the 30seconds it was on, but here is the link, and here is some info. http://www.tve.org/ho/doc.cfm?aid=588 The sari A sari is a rectangular piece of cloth measuring five to six metres in length. The style, colour and texture of the cloth varies and the traditional dress of Bangladesh women can be made from cotton, silk, or man-made materials. For centuries, the sari has been worn by millions of women throughout the Far East and, in Bangladesh, people have, for years, been using the sari to remove insects and extraneous particulate matter from sugar or molasses water, commonly used to make a local drinks. The sari is now being used in Bangladesh to filter drinking water in an attempt to reduce the occurrence of cholera. The sari as a filtration tool The beauty of the sari material is that it is thin and readily available in all villages in Bangladesh. To filter the water effectively, the sari needs to be folded between four and eight times. The folded cloth is then wrapped over the pot used to collect drinking water from ponds or rivers. After the water has been collected, the sari is removed from the pot, unfolded, and rinsed in water and then air dried in the sun for a couple of hours to decontaminate it. This is sufficient to kill bacteria trapped in the material but in the monsoon seasons, an inexpensive disinfectant can be used to decontaminate the material. Sari material is excellent for filtration purposes and as saris are found in every household in Bangladesh, this method is affordable, even for the poorest of the poor. Laboratory tests have shown that, by filtering water through four layers of sari material, 99% of the bacteria attached to and inside the copepods, as well as other matter, can be removed and, thereby, reduce the infectious dose of cholera vibrios present in the water. This is because the tiny bacteria are attached to the much larger plankton and particles so they can be filtered out easily when the plankton and particles are removed. This means that the chances of consuming a large enough dose of bacteria to cause cholera are dramatically reduced. Four to eight layers of cloth turned out to be the optimum number – any more folds can cause clogging and do not improve filtration efficiency significantly. The technique of using a sari to filter bacteria out of water can be successfully adopted in other parts of the world, using almost any material that is thin and dries quickly. ************************************************************ There were many more sites and links, but this basically explains things. Seems it WAS 99% Midas.... gotta get my hearing checked as well as my eyes..... now where are the batteries for my pacemaker..... Ahh there they are Regards, Bill (Pegasus) Quote Link to comment Share on other sites More sharing options...
Delta Posted January 27, 2003 Report Share Posted January 27, 2003 Oh, :oops: So I think it was Ira that said something like.... "nothing more than simple mechanical filtration" Gee the water must be filthy there, we are soooo lucky and take so much for granted. Thanks Pegasus.... good topic anyway. Cheers, Di Quote Link to comment Share on other sites More sharing options...
flipper Posted January 28, 2003 Report Share Posted January 28, 2003 hi, just thought i remember reading something on a bottle of "fish medicine" about certain bacteria being gram positive or gram negative.Would this fit into Delta's theory of aquatic static?? If the Indians were so concerned about h2o bacteria count+getting sick maybe they should strain the h2o through their sari then boil out any remaining germs. Anybody out there tried sneaking a back panel out of a sari down the market place?(rubs black eye) :lol: Think I'll stick with filter wool hehe. Quote Link to comment Share on other sites More sharing options...
Ira Posted January 28, 2003 Report Share Posted January 28, 2003 Nah, gram positive and negative refers to whether or not a certain stain stains the bacteria making it easier to see through a microscope, not static charges. Quote Link to comment Share on other sites More sharing options...
john1 Posted January 28, 2003 Report Share Posted January 28, 2003 Hi all Back to the comb theory. Which is actually a fact, not a theory. Ever tried to comb your hair and it sparks? Try that with wet hair. If you want to, you can use the water from a car battery John Quote Link to comment Share on other sites More sharing options...
Pegasus Posted January 28, 2003 Author Report Share Posted January 28, 2003 He he.... Might not spark much.... but it would certainly smoke a little Quote Link to comment Share on other sites More sharing options...
john1 Posted January 28, 2003 Report Share Posted January 28, 2003 Hi kriber Solvent-based paint comes of easier with solvents(turps etc). Water-based paint comes off better with water. Amazing, is it not. And I have no uni degree. Yesterday I got some paint on my hand, not much but I was extremely worried if it was negatively or positively charged..... John Quote Link to comment Share on other sites More sharing options...
flipper Posted January 28, 2003 Report Share Posted January 28, 2003 wipe the paint off with a Sari John----thats if you want a silk finnish! :lol: :lol: Quote Link to comment Share on other sites More sharing options...
john1 Posted January 28, 2003 Report Share Posted January 28, 2003 Hi flipper ......with the woman still attached? John Quote Link to comment Share on other sites More sharing options...
flipper Posted January 28, 2003 Report Share Posted January 28, 2003 you said it john--------i'm just not game to go there :lol: Quote Link to comment Share on other sites More sharing options...
Warren Posted January 29, 2003 Report Share Posted January 29, 2003 The original post states that approx 50% of bacteria are removed. What everyone seems to have missed is that not all bacteria are the same size. It is quite possible that the bacteria that cause the medical problems are fairly large and get trapped by the silk. The smaller bacteria get through but are either harmless or the people are immune to their effect. You can cold sterilise water if it is passed through a 0.25 micron or smaller mechanical filter. No bactria can pass through this size hole. A filter of this size will very quickly clog up if used in and aquarium. I use 15 micron filters on all my tanks. They do not stop bacteria getting through, but remove all particles from the water leaving it 100% optically clear. Quote Link to comment Share on other sites More sharing options...
Delta Posted January 29, 2003 Report Share Posted January 29, 2003 :lol: Some more useless facts to jiggle the brain cells :lol: Fond here... http://www.aquariustech.com.au/products11.html Quote from link..." Conductivity... is defined as the ability of a substance to conduct electrical current....... In the chemical water treatment field our interest is in measuring the concuctivity of waters which consist of ionic compounds dissolved in the water. The conductivity is quite easily measured by electronic means and this offers a simple test or control level which can tell much about the quality of the water."...Tech. Bulletin-No88 So it wasn't such a silly idea, although may have no application to Aquarium keeping and Nothing to do with Silk. :lol: cheers, Di Quote Link to comment Share on other sites More sharing options...
john1 Posted January 29, 2003 Report Share Posted January 29, 2003 Hi Di Yes, Conductivity has a lot to do with aquariums. You can actually by a conductivity meter. It measures in uS. (microSiemens). The higher the conductivity the more iron and heavy metal is in the water. But most people don't care about it. you can read about it in the Baensch Atlas. John Quote Link to comment Share on other sites More sharing options...
Warren Posted January 30, 2003 Report Share Posted January 30, 2003 A conductivity meter actually measures the amount of the total dissolved solids (TDS) in the water. This means any dissolved substance, not just Iron and Heavy Metals. It is only a guide as to how pure the water is. It cannot tell you what is in the water. Dissolving salt (NaCl) into water will raise its conductivity. Add more salt, more conductive. Pure water is a pretty good insulator and therefore shows no uS. Quote Link to comment Share on other sites More sharing options...
john1 Posted January 30, 2003 Report Share Posted January 30, 2003 Hi Warren Of course you are right, my answer was very simplified. Hi Di Most real aquarists, purists, call them whatever you like, will try to imitate the fishes original water. So for instance, Lake Malawi cichlids are in water with a conductivity of 200 - 260 uS, Lake Tanganyika's is 550 - 600uS and Lake Victoria has 96uS. So, as Warren said, pure water has a conductivity of zero. But most aquarists don't care. I personally have no idea of the significents of the waters conductivity. By the way, have you noticed the start of the thread; sari/filter, then combing of hair, then battery acid and now, conductivity. Amazing. John Quote Link to comment Share on other sites More sharing options...
Pegasus Posted January 30, 2003 Author Report Share Posted January 30, 2003 By the way, have you noticed the start of the thread; sari/filter, then combing of hair, then battery acid and now, conductivity. Amazing. And up to now it has had 43 replies.... all from a piece of fabric :) Quote Link to comment Share on other sites More sharing options...
john1 Posted February 15, 2003 Report Share Posted February 15, 2003 Hi all I though this is a place as good as any. I was talking about a filter, wet/dry which has a Bio-wheel for the bacteria. I think, Pegasus mentioned something of a DIY job regarding a filter of some sorts in a box at the back of the tank. I could be wrong regarding "where to put it". By accident I went to a site which mentioned OH filters. I thought at first they mean outside hang on filters. But it is really a filter across the whole tank. You get them in stages. 3, 4 ,5 and 1 or 2 stories high. The are filters which, from a distance look like the flouro-light-reflector. Has any one seen or heard about them? I think they are commercial units, not DIY's. I have never seen or heard about them. So any comments? John Quote Link to comment Share on other sites More sharing options...
john1 Posted February 15, 2003 Report Share Posted February 15, 2003 Hi Here is a picture of it. John Quote Link to comment Share on other sites More sharing options...
Caryl Posted February 16, 2003 Report Share Posted February 16, 2003 I can definitely say I have never seen one like that John. Quote Link to comment Share on other sites More sharing options...
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