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  1. #1
    Join Date
    Mar 2004
    Posts
    6,063

    Default water in boat tanks during the summer

    so keeping it below 25C is a great idea, unlikely in these warm days.

    what is the best way to proceed, rinse it all out every other ? time period

    extra tablets / chlorine ?

  2. #2
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    36,518

    Default Re: water in boat tanks during the summer

    I religiously add Aqua Tabs every time I fill the tanks. Never any problem with water quality. I have two 150 litres tanks, and alternate their use.

  3. #3
    Join Date
    Apr 2004
    Location
    Portchester, Solent
    Posts
    5,013

    Default Re: water in boat tanks during the summer

    Quote Originally Posted by simonfraser View Post
    so keeping it below 25C is a great idea, unlikely in these warm days.
    If it's in contact with the hull below the waterline it's likely to stay close to sea temperature. At the moment that's about 18/19C.

    We do nothing special, it turns over too quickly (small tank)
    .

  4. #4
    Join Date
    Jun 2001
    Location
    UK East Coast
    Posts
    1,841

    Default Re: water in boat tanks during the summer

    Quote Originally Posted by simonfraser View Post
    so keeping it below 25C is a great idea, unlikely in these warm days.

    what is the best way to proceed, rinse it all out every other ? time period

    extra tablets / chlorine ?
    I used to use aquatabs but now prefer aqua sol. https://www.cleantabs.co.uk/aqua-sol.php add the right amount every time to top up the tank. Water always tastes good summer and winter and no longer need to do an annual cleanout.

    www.solocoastalsailing.co.uk

  5. #5
    Join Date
    May 2007
    Posts
    38,092

    Default Re: water in boat tanks during the summer

    Quote Originally Posted by alahol2 View Post
    If it's in contact with the hull below the waterline it's likely to stay close to sea temperature. At the moment that's about 18/19C.

    We do nothing special, it turns over too quickly (small tank)
    .
    We don't turn it over quickly, so we tend to us bottled water for drinking and cooking.
    We refill 2litre bottles.
    Saves a fortune in gas, you can judge exactly how much water to put in the kettle.

  6. #6
    Join Date
    Feb 2008
    Location
    Farndon
    Posts
    3,038

    Default Re: water in boat tanks during the summer

    I am sure someone on this forum suggested a couple of years ago a tank flush with fresh tap water is sufficient (in the UK). I have since stopped my annual flush with sterilising solution.
    I would agree with the thought that the tank water is not going to become too warm , in the UK climate.
    I have on occasion noticed the pontoon water supply is warm in hot weather so let that run cold before putting any in the boat tank.
    Refilling bottles from a mains supply as also suggested seems to me a sound plan. I use 5 litre bottles for drinking and tank water for washing. An arrangement that has no issues for me.

  7. #7
    Join Date
    Feb 2007
    Location
    Essex
    Posts
    22,847

    Default Re: water in boat tanks during the summer

    Wash and shower more often.
    Far away is near at hand in images of elsewhere

  8. #8
    Join Date
    Apr 2019
    Location
    Wales
    Posts
    914

    Default Re: water in boat tanks during the summer

    Quote Originally Posted by johnalison View Post
    Wash and shower more often.
    *shock horror*

  9. #9
    Join Date
    Oct 2001
    Location
    Surrey & boat in Dorset. Both have pubs
    Posts
    3,789

    Default Re: water in boat tanks during the summer

    Just pump a load out and refill with tap water. As already mentioned hopefully the tanks are low down and at the same temp as the surrounding water. You could always empty the tanks and then refill.

  10. #10
    Join Date
    Jul 2009
    Location
    Winter in Falmouth, summer on board Rampage.
    Posts
    5,192

    Default Re: water in boat tanks during the summer

    We’re in Greece, surface water temp is mid - high twenties. We’ve never had a problem with water in the tanks going off, nor do we flush them at all. Water is used for all purposes. OK we do live on board through the summer, so turnover is pretty rapid. We empty the tanks for the winter.

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