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Is Filmtec good?

I like filmtec and use it in my RO filter.

2007-02-07 20:34:25 by galactic129

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or any other water related products like ater pumps etc,

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2009-02-22 09:42:19 by Alonso R

Price: $10.95 $10.95

osmosis is the "movement of a solvent through a semipermeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane." That's a mouthful. To understand what it means, this picture is helpful:


On the left is a beaker filled with water, and a tube has been half-submerged in the water. As you would expect, the water level in the tube is the same as the water level in the beaker. In the middle figure, the end of the tube has been sealed with a "semipermeable membrane" and the tube has been half-filled with a salty solution and submerged. Initially, the level of the salt solution and the water are equal, but over time, something unexpected happens -- the water in the tube actually rises. The rise is attributed to "osmotic pressure."

A semipermeable membrane is a membrane that will pass some atoms or molecules but not others. Saran wrap is a membrane, but it is impermeable to almost everything we commonly throw at it. The best common example of a semipermeable membrane would be the lining of your intestines, or a cell wall. Gore-tex is another common semipermeable membrane. Gore-tex fabric contains an extremely thin plastic film into which billions of small pores have been cut. The pores are big enough to let water vapor through, but small enough to prevent liquid water from passing (see this page for more information on Gore-tex fabric).

In the figure above, the membrane allows passage of water molecules but not salt molecules. One way to understand osmotic pressure would be to think of the water molecules on both sides of the membrane. They are in constant Brownian motion. On the salty side, some of the pores get plugged with salt atoms, but on the pure-water side that does not happen. Therefore, more water passes from the pure-water side to the salty side, as there are more pores on the pure-water side for the water molecules to pass through. The water on the salty side rises until one of two things occurs:

* The salt concentration becomes the same on both sides of the membrane (which isn't going to happen in this case since there is pure water on one side and salty water on the other).
* The water pressure rises as the height of the column of salty water rises, until it is equal to the osmotic pressure. At that point, osmosis will stop.

Osmosis, by the way, is why drinking salty water (like ocean water) will kill you. When you put salty water in your stomach, osmotic pressure begins drawing water out of your body to try to dilute the salt in your stomach. Eventually, you dehydrate and die.

In reverse osmosis, the idea is to use the membrane to act like an extremely fine filter to create drinkable water from salty (or otherwise contaminated) water. The salty water is put on one side of the membrane and pressure is applied to stop, and then reverse, the osmotic process. It generally takes a lot of pressure and is fairly slow, but it works.

2006-06-30 00:55:37 by Christian V

Price: $185.00

Specifically membranes that are used for water treatment.

Sorry, soapy water won't cut it; and in fact will probably make things worse. Soap won't get rid of hard water scaling - it'll just scum it up. Soap won't get rid of any mold or fungi - it'll actually feed them. Use a commercially available RO membrane cleaning solution. They have to meet government requirements.

2007-06-23 00:39:17 by Jess M.

I don't care about wasted water or power usage, just interested in filtration etc. I've heard for example reverse osmosis filter membranes can foster the growth of bacteria etc.

You can achieve essentially the same water quality with either technology, if you do not care about waste or power. RO membranes can get fouled by bacteria or alga from the source water, that is why they must be periodically sanitized by chlorination or other biocide treatment. But this is mainly because the growth plugs up the membrane, reducing the output.

2008-12-29 23:29:11 by Chris 777