TDS Meter Question

[doubledn]

I finally got a TDS meter (T3, but no Schwarzanegger).
From what I can tell, it is already calibrated. My tap water comes out to about 650ppm, while my RO/DI water is 48ppm. My question is this: should by RODI water be 0? Or is this acceptable?

Thanks in advance.

 

[Philby]

RODI should be 0.

Sounds like either you need to replace your RODI cartridges and/or ensure your TDS meter is calibrated correctly. When was the last time you changed them?

I don't have one, otherwise I'd offer to let you borrow it to ensure it had the same readings on your water.

 

[bgreenlee]

Re: TDS Meter Question

<a href=showthread.php?s=&postid=11134565#post11134565 target=_blank>Originally posted</a> by doubledn
I finally got a TDS meter (T3, but no Schwarzanegger).
From what I can tell, it is already calibrated. My tap water comes out to about 650ppm, while my RO/DI water is 48ppm. My question is this: should by RODI water be 0? Or is this acceptable?

Thanks in advance.

It should come calibrated. With your tap water at 650 you should see around a 95%-98% reduction in tds after the RO membrane, depending on water pressure and temperature. It should be around 15-30 with your incoming water having such a high tds. After teh DI cartridge it shoudl be 0 tds.

48 is very high and will cause problems with algae, etc.