i have had nothung but trouble with my 75 typhoonIII unit, i live on a well the pressure guage would read 20 psi i would get a tds of 70 on ro water made, they send me a new membrane, and i bought a booster pump, when i got it had no directions so i figured out to adjust pressure up to 55, now i have made about 2gallons and still get a ro reading of 50,i called walter and left a pretty frustered message i want him to personally call me no e-mails,any body have problems like i