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  1. #1
    Join Date
    Apr 2010
    Posts
    45

    Default Water tank, left empty or full over winter

    When putting my boat away for the winter, should I leave my boat water tank full to avoid algae growth, or empty to avoid stale water.
    The boat is stored abroad in a warm climate so freezing issues are not a problem, Any advice, as always, gratefully received.

  2. #2
    Join Date
    May 2001
    Location
    'ang on a mo, I'll just take some bearings
    Posts
    27,553

    Default

    If there really is no possibility of frost, my preference would be full of plain water with an added non-toxic-to-humans biocide. In the spring, pump it all out, refill, pump it all out once again then refill for use. The biocide most often mentioned is Milton, but if that's not available where you are then whatever the locals use for sterilising drinking water or baby's bottles.
    Next time, it'll all be different.

  3. #3
    Join Date
    Sep 2008
    Location
    on the move as live aboard
    Posts
    3,236

    Smile

    Quote Originally Posted by steveghoward View Post
    When putting my boat away for the winter, should I leave my boat water tank full to avoid algae growth, or empty to avoid stale water.
    The boat is stored abroad in a warm climate so freezing issues are not a problem, Any advice, as always, gratefully received.
    Flush it all out, clean with a very mild bleach solution, flush again and leave it. When you come back to the boat do the same again. The risk of burst pipes/rust is then eliminated.

    Peter

  4. #4
    Join Date
    Mar 2004
    Location
    East Coast
    Posts
    2,057

    Default

    My 2p....

    If its rigid then wash, rinse w milton etc then empty.
    If its a "bladder" type full with a Milton-type additive. A collapsed bladder type never dries and promotes horrible mould - all IMHO !!

  5. #5
    Join Date
    Mar 2005
    Location
    East Sussex.
    Posts
    18,218

    Default

    I leave mine full, with bleach added (same chemical as Milton but bought in liquid form as laundry bleach). In the spring I empty them and refill with fresh water. As I never drink the water from the tanks a trace of bleach is not a problem. My reasoning is that as there is no frost risk full tanks are safe, and the bleach stops any mould. If "emptied" there would still be alittle water in them, and in the pipes, so bleach would still be needed, but the parts of the tank above water level might still grow mould after the water had dried, from airborne contamination.
    Working on immortality - One day at a time.

  6. #6
    Join Date
    Oct 2001
    Location
    Surrey & boat in Dorset. Both have pubs
    Posts
    3,039

    Default

    Empty. In the spring add miltons and fill tanks right & leave to soak for a few hours. Pump out and refill a couple of times. It is what I do with no noticeable side affects so far .....

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