It s a bladder tank with ambient pressure at 20 psi. My static water pressure is 55 psi. I have a gauge on is, so when i charge it, it holds at 55. When i release the water, it drops almost immediately to 25psi, then bleeds down to zero over about 4-5 minutes. I had to play with it a while to get a balance between pressure at the heads and run time.
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