New pump to strong!!!

[chrisl1]

There is air coming in somewhere, shut down each section if you can and see where they are coming in.

[dakar]

There is air coming in somewhere, shut down each section if you can and see where they are coming in.

Chris has it dead on, what are you using for plumbing? PVC, hose? Either way check all connecting points. What about the valve you are using? Ballvalve or gate? Some ball valves have a cheapo gasket material that will allow air to be drawn in via the venturi effect created by the restriction, but they won't leak water out. <--- learned that one the hard way, drove me crazy for months until I found it.