I’m running the EcoTech M1 and have just installed the FMM and 1” flow module. The flow module read 850 litre per hour (UK), and I want 3000 lph, so I calibrated the M1 and whilst running at 109% being 7500 lph!!! The 1” flow monitor Read 1200 lph. I think I will pick up another 1” to be sure it’s okay but I wonder if this is a common problem folk have had? My aquarium is a small 365 litre (approx 90 USG) set up with 20mm return flow pipe. I have the flow monitor installed vertically. Cheers
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