Calgary water and RO; what's your TDS after the RO?

[Delphinus]

You got that right. 3 weeks on and almost 1/3 done.

Thanks for the info.

I'm pretty sure something's wrong. The fact that I'm on my 3rd membrane in a year that exhibits this means I must have something wrong in my configuration. The only thing I can think of, off the bat, is the fact my RO/DI feeds a number of float valves (1 for each tank). So the pressure in the discharge line is always high (thus shutting off via the solenoid shut off kit). So it's always on for a short burst followed by a long period of off, following the evaporation rate.

The only thing I can think of to change that is to fill a bucket first, then shut off the inlet water. Let the bucket feed the float valves over the course of a day, then refill the bucket in one go (once a day kind of thing).

How do you have your top off? Float switches or float valves?