Bacteria/mold etc in the water tank can cause that... a heavy dose of bleach, and flushing the tank several times will help clear it. You should probably also follow up the bleach shock treatment with several tanks of fresh water and then one of water/vinegar and then several more of water.
Let the vinegar/water mixture sit, since it will help neutralize any odors in the system.
I would also recommend, if you have an access hatch, to scrub the water tank's innards and replace all of the hoses.
The bleach will kill most of the stuff in the deck fill hose and the top of the tank, if you fill it so that water is pouring out of the vent.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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