“How did you test your mains flow?”
Initially with a bucket calibrated at 5 litres.
The plumber confirmed my measurements with a weir gauge.
www.bes.co.uk/monument-water-flow-cup-weir-gauge-dual-measure-11491/
I suspect the main cause of the low pressure is that the feed from the mains is 15mm copper pipe and it’s a fairly long run to the mains.
What sort of system were you considering?
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