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Discussion Starter · #1 ·
I read in the plumbing and FDA codes that water tanks are required to have vent strainers to keep out bugs, and that they be angled down to keep out dust. But I've seen many boats where neither is fitted.

I've seen some where a strainer is incorporated into the through-hull, but more where the vent is a simple mushroom fitting. Are internal strainers ever fitted? I'm sure external strainers are often omitted because the vent is also the overflow, and if they were clogged from the inside, these cannot be cleaned. But I'm not sure that is a sufficient reason for no strainer at all.

I wonder because I occasionally find a bug in the tank, and that seems, well, stupid (my boat has no strainer).
 

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Discussion Starter · #4 ·
A good many boats--mine included--have the vent outside, so that an overfill is harmless (I saw a small boat nearly sink when the owner was distractd by dock talk).

Just sayin', folks worry about water filtration and chlorine and microns.... A couple of stink bugs top that.
 

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Discussion Starter · #7 ·
Rich: I understand the food requirements, though I doubt such a filter exists on any boat. As I mentioned, the code calls for a screen on drinking water storage tanks. Obviously that line cannot be both overflow and vent if there is a fine filter. How would you treat the over flow? Do we simply figure it will back out the fill pipe? I think that is what Mitiempo was suggesting. Clearly, with anything more than a strainer, the vent can no longer serve as overflow.

As for salt water coming in a vent, that doesn't require it to be inside the cabin, it just requires using a routing such as would be used for a fuel tank vent. Cabin air is probably better than outside air, but it's got bugs too. In fact, bringing it to the galley sink, where food is being prepared, dishes washed, and water splashing at the same time the vent is drawing is not perfect. Not at all.

I'm not at all paranoid about what I drink, but the more you dig the more you're reminded of the complexity of the trade offs.

What you did not answer is whether your boats have a screen on the vent line. My assumption from your answers is that they do not. Does the swan? Interesting.
 

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Discussion Starter · #11 ·
Original question; who has a water tank vent strainer or filter? I'm beginning to suspect they are rare.

Yes, I understand most water tanks are filled at atmospheric pressure. That is obvious.

I won't accept a system where I have to stay and watch. Fuel, yes, water, no way.

I'm not certain I believe that a membrane filter buys the bus folks any actual safety; I suspect it is about liabilty. On boats, unless we were to adopt true sanitarty practices--neither pratical by design nor practice--we wouldn't gain either. In the food packaging business the issues are very different.
 
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