epsom salt? for low magnesium

[Legalizdahurb]

RO = reverse osmosis. Ok then what makes water like this? Sorry if i am bwing really stupid here but u never learn if u dont ask.

[karmaxul]

Long explanation from: http://www.howstuffworks.com/question29.htm

To understand "reverse osmosis," it is probably best to start with normal osmosis. According to Merriam-Webster's Collegiate Dictionary, 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."

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).

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.

[The Grim Reefer]

Great explanation. :thumbsup:

I used to work with/around RO Units all the time.

[Legalizdahurb]

Ahhhhh right i think i get u.

---Spliff break after reading all that!---

U mean filtered water e.g.the brita thing i use.
or am i still confused lol
I have heard of osmosis from how water curing workes.
If understand now, i will have 2 start using the salts buster is bringing round here tomorow.

[Legalizdahurb]

P.s. Should i stop filtering my water, i was doing it to get rid of anything the plants didn't like such as chlorine.

[karmaxul]

Mellow Man,
How the ladies doing?

One love
c

[bluntman2006]

1 - t-spoon per gallon is what I use when I need it.

yeah!what he said