The taste is the big clue here. Does it taste salty or does it taste more like a chemical taste? At 55 BAR or approximately 800psi the pressures supplied are spot on. Did you flush the new membrane for 20-30 minutes before you pressurized your RainMan? All new watermakers are shipped with the membrane/s stored in a preservative that must be flushed out first (Without the system under initial 800psi pressure) Starting a membrane that is soaked in preservative under 800psi can drive this preservative into the membrane surfaces causing clogging and damaging the membrane. If you did not flush the system, try again but this time double the flushing
time to 40-60 minutes then re-pressurize. This will take out any chemical taste. It is extremely rare to see a brand new membrane fail right out of the bag and giving high TDS readings which you would taste as any hint of salt
in the water
. I see RainMan chimed in above. But if we can be of any assistance we are here in the S. Florida
area as well.