Read here for a newbie opinion:
If it is off, or if your filters are not doing their job, it will still register on the
TDS meter when the TDS rises. You will know by the rise in the TDS that the DI carts need to be changed again.
My tap water -with a
water softener- registers at 330ppm. Distilled water registers at 0 PPM. I will calibrate it real time. 1 sec. I have to pee too, hold on, this may take a minute.
Wow, that was off a little. The 800ppm solution read as 682. Acclording to the scale on the solution 71.6 deg F solution should read 754ppm. My soultion at 72.1 read 682. I calibrated it and now my tap water clocks in at 447ppm at 67 and 344 at 114.5 deg F. Time to kick my water "softener" in the A.
If it is reading 7-10 now (with me assuming your RO-DI water is much less than 77 deg F) at normal temps it would read a little higher.
My RODI temp is a chilly 55.2. According to the scale on the solution the 800ppm solution at 50 is 578 and at 59 it is 649. I would assume you RODI is about the same temp, so maybe your meter is not calibrated.
Now to check the water filter. It read 14ppm at 66.4 deg. That is with 2 100GPD RO and 3 DI carts. My DI is VERY old. I know I need to replace them. But that guy with the bulk DI
is way too busy for me to pick some up.
-tests were done with glass shot glasses "obatined" from chi-chi's. They were rinsed very well with distilled water. Probe was also rinsed with distilled between tests.
My conclusion- watch the meter and notice when it rises. After you notice algae, look at the TDS on the meter. Pick a number less than the TDS level on the algae date. That is when you need to change your DI, or maybe even your RO.
But thats just me.
I don't even listen to me.
