I'm wondering how your RO water pans out when you measure the TDS. I've not changed the membranes in my GE Merlin since I bought it about a year ago. I noticed that out of the spigot, it comes in at 10 PPM of disolved solids. Strangely enought, in the ATO reservoir that has only had RO water in it, the reading is 50 PPM. I attribute this to contamination somehow (not a biggie) as a by product of leaving about 1/3 of the water in the reservoir before I refill it. My water is typical Peninsula Hech Heche water.
Question: how does your RO water measure up when you test TDS? At what point would you suggest changing out the membrane/s (mine runs two membranes and is an "on demand" system with no tank)
Question: how does your RO water measure up when you test TDS? At what point would you suggest changing out the membrane/s (mine runs two membranes and is an "on demand" system with no tank)