I bought a draper pump but didnt realise it cut out at 3 bar 50 odd psi which isnt nowhere near what a merlin needs so i believe, it is impossible to use with the draper pump as keeps cutting out when it hits 50 psi so i may as well just meep 35-40psi from tap which makes water slow and at a high tds..
What ppm are you getting before merlin and after at 80 psi matey??
Taa