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2008-03-21 06:24:54 by purewater

www.pakwatercare.org Water Purification Systems - For All Applications The Pakwater Care Services All Water is Different. Why should your Water ...

Do drinking RO water prevents you from water borne viral diseases like Hepatitis?

It appears so, but I got this quote off of a website for water filters, so maybe they are biased. However, I was always told they could.

"The pores in a reverse osmosis membrane are only approximately 0.0005 micron in size (bacteria are 0.2 to 1 micron & viruses are 0.02 to 0.4 microns)."

2009-05-16 01:30:00 by vijay k

Price: $399.99 $215.49

Filters change out at the push of a button
Each individually contained filter just snaps into place. Including the membrane.
High end "Designer" chrome airgap faucet

hi-tech

The term reverse osmosis comes from the process of osmosis, the natural movement of solvent from an area of low solute concentration, through a membrane, to an area of high solute concentration if no external pressure is applied.

In simple terms, reverse osmosis is the process of pushing a solution through a filter that traps the solute on one side and allows the pure solvent to be obtained from the other side. More formally, it is the process of forcing a solvent from a region of high solute concentration through a membrane to a region of low solute concentration by applying a pressure in excess of the osmotic pressure. The membrane here is semipermeable, meaning it allows the passage of solvent but not of solute.

The membranes used for reverse osmosis have no pores, the separation takes place in a dense polymer layer of only microscopic thickness. In most cases the membrane is designed to only allow water to pass through. The water goes into solution in the polymer of which the membrane is manufactured, and crosses it by diffusion. This process requires that a high pressure be exerted on the high concentration side of the membrane, usually 2 - 14 bar (30 - 200 pounds per square inch) for fresh and brackish water, and 40 - 70 bar [(600 - 1000 psig)] for seawater, which has around 24 Bar (350 psi) natural osmotic pressure which must be overcome.

This process is best known for its use in desalination (removing the salt from sea water to get fresh water) and has been used in this way since the early 1970s. Its first demonstration was done by Sidney Loeb and Srinivasa Sourirajan from UCLA in the California town of Coalinga.


When two solutions with different concentrations of a solute are mixed , the total amount of solutes in the two solutions will be equally distributed in the total amount of solvent from the two solutions. This is achieved by diffusion, in which solutes will move from areas of higher concentration to areas of lower concentrations until the concentration in all the different areas of the resulting mixture are the same, a state called equilibrium.

Instead of mixing the two solutions together, they can be put in two compartments where they are separated from each other by a semipermeable membrane. The semipermeable membrane does not allow the solutes to move from one compartment to the other, but allows the solvent to move. Since equilibrium cannot be achieved by the movement of solutes from the compartment with high solute concentration to the one with low solute concentration, it is instead, achieved by the movement of the solvent from areas of low solute concentration to areas of high solute concentration. When the solvent moves away from low concentration areas, it causes these areas to become more concentrated. On the other side, when the solvent moves into areas of high concentration, solute concentration will decrease. This process is termed osmosis. The tendency for solvent to flow through the membrane can be expressed as "osmotic pressure", since it is analogous to flow caused by a pressure differential.

In reverse osmosis, in a similar setup as that in osmosis, pressure is applied to the compartment with high concentration. In this case, there are two forces to consider influencing the movement of water: the pressure caused by the difference in solute concentration between the two compartments (the osmotic pressure) and the externally applied pressure. In the same way as in conventional osmosis, the solute cannot move from areas of high pressure to areas of low pressure because the membrane is not permeable to it, only the solvent can pass through the membrane. When the effect of the externally applied pressure is greater than that of the concentration difference, net solvent movement will be from areas of high solute concentration to low solute concentration, and reverse osmosis occurs.

2006-08-12 01:41:12 by kamlesh p

Price: $289.00 $122.99

Automatic Shut-Off Valve eliminates waste by closing the feed line when the tank is full
High quality filters for superior performance.
NSF listed storage tank

I have a mature cold water fish tank of around 2years. When I first set it up i was aware of RO Water but as i did with my first tank i use ordinary tap water but conditioned. I was just wondering weather if i invested in a reverse osmosis water Purifier would it improve the overall health of my cold water fish? Also could you give me some indication of how much one of these would cost?

Thanks Dave
Nope no real problems. I would just like my fish to live in the best possible enviroment, so you think i should just carry on with what im doing?

No exact idea on pricing, there's so many different systems out there, just have to compare.

Assuming your tank is freshwater, RO water would be good to use if you had a high ph problem. You also need to buy a special "additive" to add the minerals and such back into it. Or, mix it with regular tap water.

If you're really having no problems, I would just stick with your regular tap water. If you are having problems, what are they? May not be an issue with your tap water directly.

EDIT: Yeah, I'd just continue with what you're doing then. If it ain't broken, don't fix it :)


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2009-04-11 13:25:26 by Dave

The water purifier we are using at our home is producing gallons of waste water.

RO is rather benign, and its products could likely be used to water plants. Brine water softeners are another matter. Even so, that water could be used to flush toilets.

2007-10-19 03:08:49 by sunitha v