reverse osmosis water purifier

[robind]

anybody know if this would work on sea water? http://www.emwc.uk.com/Details.asp?ProductID=539

 

[Jonny_H]

I emailed them about another of their reverse osmosis products - they said it would remove salt upto the normal levels found in domestic water, but was not designed to remove the high levels of salt found in sea water.

I assume your eyes lit up like mine when you thought you'd found a 'watermaker' for that price!

Jonny

 

[Oliveoyl]

Well, if it removes 99% of sodium, and 99% of chloride, it should be able to cope with salt!!
But the "typical" results are based on the treatment of mains water - bet it wouldn't get 99% of bacteria out of ditchwater, nor 99% of salt out of seawater

 

[Jonny_H]

That was exactly what they said - 99% of salt based on tap water which has a very low salt content - it couldn't remove 99% of salt from sea water

 

[Sy-Revolution]

......besides, you'd still need a pump, and that's what costs!

 

[boatbuilder]

Screwfix have one in their catalogue including a pump, I presume that it won't work with salt water either.

 

[Anonymous]

The choice of membrane and pressure are different for different salinities. Most of these under-sink units are designed for fresh potable water inlet, some are rated for near-brackish well water. I think you'll find that if you try to run it with sea water it will just fail to pump.

When I run my Spectra watermaker with fresh water (when flushing) I get a fair flow through the membrane with minimum pressure - at that setting it wouldn't function at all when drawing sea water.

By the way, these things are very common here in Spain and you can get them from €99!

 

[robind]

What a shame! /forums/images/graemlins/blush.gif(( never mind!