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School me on Watermakers

Discussion in 'Technical Discussion' started by PSW, Jan 31, 2017.

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  1. Knight

    Knight Member

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    Yes your right when your wanting on demand but to fill a holding tank could be simpler if you can tell how full tank is or use solenoid and float switch. I had auto fill on my tanks this way. Not sure how long membranes would last with saltwater though.
  2. Pascal

    Pascal Senior Member

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    Good luck with that ... there is no way you will make potable water at 100psi

    If you believe that... you believe you kept your plan and your doctor :)
  3. Knight

    Knight Member

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    Unless filtering saltwater is different and needs more pressure. It's not much different than using a RO in your home. I would curious if the same system would work on a boat. Just throwing out some ideas.

    O I never believed anything that man said lol. Still don't!!!
  4. bayoubud

    bayoubud New Member

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    Right need 800 psi or more for saltwater. I think Knight is talking about RO setup for freshwater for household use..
    RO pressures:
    Freshwater 50-225 psi
    Ground/Brackish 100-600 psi
    Saltwater 800-1200 psi
  5. Knight

    Knight Member

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    Yeah you probably need high pressure for high gph. O well I thought I was on to something.
  6. captholli

    captholli Senior Member

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    High pressure is required to separate the fresh water molecule from the salt water through a permeable membrane.
  7. bayoubud

    bayoubud New Member

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    You are, I recently learned the difference in RO pressures when I was trying to figure out how to make spotless water to wash a boat without spending a bunch of money on a marine watermaker.
  8. captholli

    captholli Senior Member

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    De-ionization or a D.I. system can be home made from a 3"x 24 '" schedule 80 PVC pipe with end caps , 3/4" male and female hose fittings in each end & a suitable plastic media and rock salt. You can make a reliable & rechargeable system for spot free water for $75.00 or less if you do a bit of home work design & parts wise.
    Last edited: Mar 12, 2017
  9. bayoubud

    bayoubud New Member

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    Sounds simple, I will look into it. Thanks

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