How to get fresh water tank clean enough for the wife?

Discussion in 'General Discussion' started by mnm99, May 7, 2017.

  1. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    So I think the fresh water is fine. Good enough for a shower, but would never drink regardless. The wife won't even take a shower and sometimes even wash her hands.:smt101. She says it smells funny. Last year I flushed it many times and added a cap full of bleach, re-flushed and re-flushed. Any ideas what I can do to make it really clean. As I said I really don't smell anything. Thanks.
  2. skibum

    skibum Well-Known Member

    Jul 30, 2007
    Perry Hall, MD
    2005 Sundancer 260
    496 Magnum HO
  3. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    We never drink water from the boat faucets either, but we do everything else with it. I use bleach to sanitize it and use the fresh water tank all the time to keep it fresh. I almost never use the dockside water inlet which forces me to keep the water in the tank fresh. That helps a lot.
    If she doesn't like the smell of the bleach you can get the sanitizer tablets in Walmart in the section where they have the RV stuff. That's also a great place to get RV/Marine TP.
  4. Alegria

    Alegria Well-Known Member

    Feb 21, 2009
    Lancaster,PA Boat: -Sue Creek, MD
    2000 410 DA
    3126 CAT
    We use aquabon. No odor. You can get it at West Marine. Also the same treatment in West Marine brand works just as well and is cheaper.

    Sent from my XT1575 using Tapatalk
  5. NotHerDecision

    NotHerDecision Well-Known Member

    Jun 28, 2016
    Houston, Texas
    2001 Sea Ray 460 Sundancer
    2014 Seadoo 155 LTD
    2105 Seadoo 130 SE
    2013 Mercury Dinghy
    Cummins 6CTA 8.3L
    Our water is fine but we have a Pur water faucet filter on the galley sink for drinking. We also filter the water when it comes in with an online filter. This really helps.

    Sent from my iPhone using Tapatalk
  6. Bop

    Bop Active Member

    Sep 3, 2013
    Georgian Bay/Lake Huron
    2001 410 Express, Highfield DL350 w/40hp Yamaha
    Cat 3126
    Maybe the Ritz Carlton would be a better solution lol.

    Sent from my iPhone using Tapatalk
  7. BlueYonder

    BlueYonder Member

    Jan 12, 2015
    Chesapeake Bay
    QSC 8.3 600
    Check and clean the filters on your water pump.
  8. northshore

    northshore Well-Known Member SILVER Sponsor

    Jan 17, 2011
    Cleveland, OH
    1989 340 Sundancer
    Raymarine E90W Radar/Chartplotter
    Twin 454 Mercruiser 340's
    What I've done in the past...
    Fill the fresh water tank completely - 1/4 cup of bleach per 15 gallons of water.
    Run the water out of every faucet, spigot, flush the toilet and make ice cubes if so equipped till you know bleach water is coming out.
    Let the solution slop around in the tank and stand in the lines for a day.
    Run the water on everything again and let stand for another day.
    Drain the tank and refill. Run all the faucets again. Repeat till there is no more bleach smell.

    I use two 3M RV filters in my water system. Probably overkill but I seriously do not want anyone getting sick but want ice and drinkable water.
    I installed the WV-B2 after the fresh water pump and the USF-C in the line that feeds the ice maker and dedicated faucet.
    If you do end up going this route, I replace the filters every spring and they are a bit on the expensive side.
    The WV B2 filters are discontinued and are becoming hard to find but 3M has one that can be used in their commercial line with similar specs.
    If you do start using filters, pull them out of the system before doing the bleach treatment.

    This is really one of those thing where if its worth doing, its worth overdoing (IMHO).
    3m rv marine filter guide.jpg
    Last edited: May 7, 2017
  9. alnav

    alnav Member

    Sep 16, 2009
    West River, MD
    40 MY
    QSB 425
    Are you sure it's not just the hot water that is smelling? As you have been conscientious about the main tank, I would look there. It could be you need a sacrificial anode or that the heating elements have crudded up. If you can get to it, it's probably worth the effort to check and inject fresh water into that tank directly and flush.
  10. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    Get a whole house carbon inline filter put it just after the 12 volt pump.
    Our watermaker has a carbon filter and it takes out bad taste.
    We have never got sick and use the tank water for all things including ice and drinking.
    I replaced a water tank on our first boat. To get it out I cut it in smaller pieces. There was definite slime in the bottom. I do not think there was any way to remove the slime. I tried the 24 hour bleach and all we got was bleach tasting water for a while.
  11. Boatingnut

    Boatingnut Member

    Dec 18, 2008
    Saugatuck, MI
    2001 Neptunus 56 Express
    3196 Cats
    PUR filter on the faucet.

    Sodium Dichlor in the water tank. Works wonders. Just don't overdose. No need.
  12. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    Is there anything that will get the thin film of slime of the bottom of the tank. Was thinking a lot of baking soda solution then adding vinegar. It sure would bubble for a while.
  13. endless seas

    endless seas Member

    Feb 13, 2008
    1997 450 DA
    Cat 420
    I went to a pool supply store did some research and did a ( shock it ) to get the PH levels back to normal. I had to clean the water pump filters several times but this took care of it. FW hit it on the head about the PH levels.
  14. coachandy

    coachandy New Member

    Feb 3, 2015
    Northeast US
    270 Sundancer
    454 Mercruiser w/Bravo III Drive
    The absolute best solution. Empty and flush the tank. Pour in a couple gals of cheap vodka and let it slush around for a couple days. Then drain, flush and fill and your good to go with no smell or taste.

    Sent from my iPhone using Tapatalk
  15. Joel_MD

    Joel_MD Member

    Jun 20, 2016
    Chesapeake Bay
    390 Motor Yacht, 2005
    Cummins 480 CE
    My approach to a clean fresh water tank is very similar to this. I do the bleach treatment once at the beginning of the season and usually once more later in the season. Usually we don't ingest water from the tank but I like it to be clean and drinkable anyway.
  16. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    When you get it clean, keep it clean. Drain it completely at the end of season. Blow out all your lines with compressed air and skip the antifreeze

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