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Old 29-01-2009, 19:41   #16
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Your trying to reinvent the wheel. Even if you could " filter" out the salts how long will the filter last and at what cost.
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Old 29-01-2009, 19:43   #17
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This system is designed for purifying domestic drinking water and will be no good for seawater
Of course, but I wasn't thinking of using it for that as is, i was thing of using it as a basis for a system that would do that, which I'm sure can be done, its just a question of how many extra filters and power would be needed....
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Old 29-01-2009, 19:45   #18
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Your trying to reinvent the wheel. Even if you could " filter" out the salts how long will the filter last and at what cost.
Well the filters of the machine that does do this are said to last a year(see the west marine link)... and I'm sure that buying the spare filters from that company and adapting them for this would work out cheaper than their machine... (or at least hope... I probably won't have the time or money to do this, but I like thinking about these kind of things...)
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Old 29-01-2009, 19:50   #19
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But my logic behind this idea is, that if they can make a machine that does 40gal/day and draws only 4a @ 12v and sell it and make a profit for $3300, then surely a 2-4gal/day machine is possible for cheaper?
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Old 29-01-2009, 19:52   #20
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Well good luck with that. I do hope you figure it out. But you assume too much. imho
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Old 29-01-2009, 19:53   #21
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Lol... well assuming that you can't do something and never knowing is worse than assuming that you can and failing IMHO...
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Old 29-01-2009, 19:55   #22
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The human race wouldn't of got much past making fire if we all thought that...
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Old 29-01-2009, 22:09   #23
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The human race wouldn't of got much past making fire if we all thought that...
Given the state of the environment maybe that would have been a good thing.

This is just a thought ( and maybe its a stupid one), but I wonder if you could take one of the hand pump ones and rig it up to a motor or engine and go about it that way. The old type of par diaphram pump had a sort of connecting rod that went up and down, however I'm not sure how much power it takes to pump a manual one.
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Old 29-01-2009, 22:15   #24
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'I wonder if you could take one of the hand pump ones and rig it up to a motor '

That is a fine thought quidam!
And I can't help but agree with your other thought too!
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Old 29-01-2009, 22:18   #25
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Jaz you're a hoot and a Rube Goldberg holler and definatly a guy to have at a party full of sailors. When and if you get back with those barrels of Cuban Rum look me up I just gotta check out your boat.

PS Spectra will be raffling off a Ventura 150 at the Latts and Atts party in Miami this Feb. Buy a few arms length of tickets and good luck. LOL
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Old 29-01-2009, 22:51   #26
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Haha... thx Tellie!
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Old 29-01-2009, 22:56   #27
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But even if I wanted to, I would have alot of trouble getting back into the US from Cuba, especially carrying Cuban Rum!!!
My plans are for more out of the way places, and I doubt that I'll be visiting the US or Europe anytime soon.
But I shall certainly post updates of my travel's here and attempt to meet up with anyone who fancies a drink or three at port!
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Old 30-01-2009, 00:31   #28
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Filters and semi-permeable membranes are not quite the same thing. Filters are not going to remove salt. Semi-permeable membranes are used in reverse osmosis (RO) watermakers. (Some people say filter when they are actually talking about the semi-permeable membrane in their RO.)

You're going to have troubles modifying the freshwater RO. Osmosis pressure is related to the concentration of the solution. The freshwater RO is designed only for very low concentrations of salt (see the last link below, Gord's contribution). The parts of the fresh water RO are only designed for about 70 psi, this is not high enough for the concentration of salt in sea water, so nothing will happen. The only way to make it work is to turn up the pressure (to around 800-1000 psi), that means replacing everything on the freshwater RO.

John

Osmosis pressure equation and example.
ChemTeam: Osmosis Equation



Description of RO.
Reverse Osmoses.

Discussion of trying to use under sink RO.
no energy input water maker
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Old 30-01-2009, 04:59   #29
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All I hope is I do not run into capt jaz for if there was a way to make life more difficult he will find it. Between wind generators and water makers I need another rum oh no that too
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Old 30-01-2009, 05:13   #30
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Cheers John, thats the most objective view I've had on this point so far. Just woke up though, so not ready to turn my brain on yet till I've had my coffee...
Lol.. meyer... Most things in life are easier when you go everywhere that everyone else goes and have money to pay the asking price for everything you want, but where would the fun be in that??
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