Stainless Steel

Discussion in 'General Discussions and Advice' started by JS, 27 Mar 2015.

  1. JS

    JS

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    Hi.

    I see some stainless uv lights...that are mainly meant for undercounter water purifucation...sold as marine uv sterilizers? Anyone care to share some advice and opinions on this?

    304 stainless will surely corrode in saltwater? i see how all my stainless stuff on my boat oxidises with that white powder....

    Has anyone been running one of these units for a while? Any adverse affects?

    Thanks
     
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  3. TheWaterboy

    TheWaterboy Sponsor

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    lol.....yes thats well spotted and yip i saw that aswell...

    no they may not be used as they will corrode, first and foremost on the weld joints...then on the tube itself
    we tried this 10 years back with our 3 in 1 reactors .....and that was the reason we stopped them for so many years and only recently revived them with the pvc units.

    304 stainless unit will corrode on the weld joints of the thread and on the encaps weld joint....
    by the time it makes a hole and you see it corroded from the inside out.....its to late and your tank could be a hair algae festivile

    the units in question should be used on boreholes and jojo tanks, cant see why it would be sold and advertised on a marine forum

    you want to use uv on a marine system.......pvc is the only way;)
     
    Last edited: 27 Mar 2015
  4. JS

    JS Thread Starter

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    Thanks Marco. Exactly what i suspected.

    Buyers will probably end up searching for the source of their problems elswhere....when it will be caused by somethibg they probably bought to help reduce or eliminate a problem such as algae.

    Seems some people will just do about anything to make a buck these days...
     
  5. sandersc

    sandersc

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    Definitely agree with you TheWaterboy. Even the best SS with start to corrode at some stage, where it got knocked or hardhandled in one or other way.

    I've seen rudder shafts from very good quality stainless steel pitted in such a way , you wont believe.
     
  6. dallasg

    dallasg Moderator MASA Contributor

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    the rust is not so much a problem, iron oxide, eg. rowaphos but my fear is whether or not any of the constituent metals (i.e. iron, nickel, chromium...) may leach past the oxide layer into the aquarium system, anything not 316 i wouldnt use, and even then very temp
     
  7. sandersc

    sandersc

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    Last edited by a moderator: 26 Nov 2015
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