TDS measurement

[winstew]

I just installed my new inline TDS meter to my 5+1 RO/DI unit that I have had for about a year. My well water inlet is around 300ppm but my RO/DI outlet is around 5ppm. Question is.... Is 5 ppm to high? I know it should be around 0 but what is an acceptable tollerance?

 

[yosemite sam]

It should be 0. If the setup is a year old, and the TDS is reading 5, that might be a good sign you need new filters, especially if the incoming water is reading 300. That's pretty high. I get about 120ppm here in the city, and change my filters about every 9 months, and the membrane at 14-18 months.

 

[ravennreef]

5ppm is a little high. When my RO/DI unit gets above 3 I switch out the filters and am back to 0. People recommend changing the membrane and filters about every 6 to 12 months. They arent cheap but the PPM will just keep rising if you dont.

 

[1journeyman]

My tap water is 575-600. RO/DI 0.0
I'd change your filters.

 

[yosemite sam]

Originally Posted by 1journeyman
My tap water is 575-600. RO/DI 0.0
Wow, 575-600! How often do you change your filters?

 

[1journeyman]

Had the unit for 4 months now, no changes so far.

 

[winstew]

You think the membrane needs to be changed as well? or just the filters and carbon?

 

[acrylic51]

Membrane should easily be able to go 24 months.....I'd swap the other filters first and see what your readings are.....

 

[bonebrake]

Originally Posted by acrylic51
Membrane should easily be able to go 24 months.....I'd swap the other filters first and see what your readings are.....
I agree.
:joy: