On 8/2/2014 4:03 PM, Frank wrote:


I think originally that there was no bladder in pressure tanks and they
just relied on the air space. They added bladders later since the air
will eventually dissolve in the water requiring air to be added frequently.

The one I saw briefly, had a doodad that looked
like a flying saucer with a hose. I think that's
designed to inject a small bit of air each time
the pump cycles.

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Christopher A. Young
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