The best way to prevent growth of stuff in your tanks is to shock treat the tanks properly, using chlorine bleach, and then to keep the water moving through the system. The only time you really get nasty growth in a good fresh water system that has been shock treated properly and filled with clean water is if the water sits stagnant for an extended period of time.
Also, you should avoid putting any water that is questionable into your water tanks. Pre-filtering the water, with a strainer will help keep a lot of the gunk out of the tanks. You should wash down the deck in the area of the water tank deck fill, to help remove any dirt and gunk that may otherwise get washed into the water tanks from that area, prior to filling your water tanks.
If you use a hose in a marina to fill your tanks, make sure that you run the water long enough to flush what ever has been sitting in the hose and baking in the sun. That may take a few minutes, but the water coming out of the hose, when you are about to fill your tanks, should be fairly cold, and fresh out of the underground water main.
Obviously, if your marina uses a large, above ground tank or cistern, then this may not be the case.
Hope this helps.
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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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