Another RODI question

[Mrramsey]

1) It produces more than 150gpd. I filled my 200g tank in ~day with input pressure of about 75psi.
2) At least for me TDS coming into the DI settled at 4-5ppm and output is still zero TDS.
3) Not exactly measured but waste output looks to be identical to output. So I suppose the "water saver" claim comes from the lower rejection membranes used.
4) The unit was flushed a full hour before use.

The water company has not published a quality report since 2012 but they have been cited for excess TDS more than once with the report listing the tested range at 240-540PPM.

#2 is the key... at 4-5ppm after the membrane your incoming TDS is likely less than 100.

 

[Mrramsey]

I would swap out the membrane at the same time as the DI, at the rate that you are going through DI it would pay for it self pretty quickly.

Remember for every 2% you improve the membrane rejection rate you double the DI life

Yep... I will be contacting spectrapure today.