Air in Monsoon 3 Bar Shower Pump Every Morning Then Fine Once Bled Until Following Morning All aspects of plumbing questions and answers, help, tips and information

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Fitted a monsoon 3 bar shower pump about a year ago and is getting air in the system. I fitted a salamander s flange when i put the pump in but it only gets air in the pipework first thing on a morning, once bled out it works fine till the following morning when the same process starts all again, anyone got any ideas.