You can use from a 50 GPH up to a 120 GPH or even larger if you use an flow control valve to slow the flow to you garden.
I use to use 1/2 inch PVC. Here is a gluing tip for you. Because the bottle is such a tight fit around the 1/2 pipe use PVC Cleaner instead of the thicker PVC Glue so can seep down and give you a leak free connection.
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