There are a number of vendors that produce reef-quality units configured correctly for use in the hobby. We encourage you to do some research before you buy.
Mine runs with about 55-60psi with no problems. I would agree, sounds like something is not hooked up correctly OR if you have an auto-shut off valve it might be leaking RO water into your waste (or visa versa)..
Thanks guys,I bought two new 75 gal membranes and hooked it up correctly,and then----180 GPD with 0-TDS reading.Apparently it was hooked up wrong from the factory.