Dual In-Line TDS Meter?

[Brimc]

I would grab TDS meter if there are extras avaliable.

 

[JayG]

I sent you a PM a while back letting you know I was going to the meeting and would like to pick up my meter there. Just making sure you're aware I still want the unit I ordered

Thanks you

 

[Scuba_Dave]

Sent U PM on PU, today or tomorrow after work, or...?? Thanx

 

[Scuba_Dave]

Thanx Joe, sorry it took so long

 

[Deafasa]

Thanks again Joe for putting this together.

Jeff

 

[lactrain]

Just a quick question .... I got a unit with this exact meter on it (originally installed) .... IN is before the RO and OUT is just after the RO .... should I switch the OUT to the position just after the DI (product water) ....

Im sure it will give me a better determination of how pure my source water is BUT will this make it harder to determine when my RO membrane is spent.

Len

 

[Deafasa]

Why not move the IN to just after the RO and OUT to just after the DI. Do you need to know how bad the incoming source water is?

 

[lactrain]

Note: The NSF Standard for Percent Rejection is 75%. We recommend replacing the RO membrane once it tests at 80% rejection or lower.

I pulled that quote from the page linked at the begining of the thread .... this is the assumption I was under .... and that in order to determine that the ro membrane was in need of changing this is the math that would need to be done. Based on the before the RO and then the outgoing after the RO

Sure need some insight here ....

 

[Piscevore]

yeah, you'd be testing the plain old tap water against the RO membrane... before and after...someone was suffering for palyotoxic shock or something

 

[lactrain]

huh .... not quite the answer i was looking for .... but typical.

 

[nickoz]

Edit: I should read the whole thread.... dup post..
-------------

I think it would be better to have the Meter-IN on the RO-OUT and the Meter-Out on the DI-OUT. IMO I dont see much value in continuously monitoring your TAP water. You really want to see if your RO and DI outputs TDSs increase to determine if your membranes need to be replaced.

-nick

 

[lactrain]

Here is why I questioned it ..... Just recently I had to change my first two filters in my 4 stage RO/DI .... my TDS OUT after the RO was reading twice what it normally reads after 6 months of operation.

The Meter on the IN read twice what it normally reads so I took a guess and changed the first two stages and my TDS returned back to normal.

I could tell it wasnt a faulty RO Membrane (Chloromines) by the percentage of TDS it was pulling out.

Is this a true statement .... If my source water rises in TDS will the product water reading after my RO rise as well.

 

[cjburden]

Don,
Glad to see you made your way over here!
WELCOME not sure if Joe has any left (they were for pick up last meet) but these are neat toys

Has anyone set there's up yet?
I did and I used it on the incoming and the finish water getting about 780 and 0
That's cool but then I decided "Who cares about the incoming" so I'm changing to after the membrane and the finish water that way you can monitor the condition of the membrane.

I was just reading. EPA states the max level of contaminents in secondary drinking water should not exceed 500ppm's.

That makes the 780 going in seem a bit scary.

 

[Clutchcargo]

Did anyone check the discrepency between the in and the out before installing this unit on your RODI lines? I poured a glass of tap water and pulled the probs out of the T-Connectors. I got a difference between the two probes of about 15PPM (220ppm In 205ppm Out). My hand held TDS meter also reads about half of what this reads (117ppm). Did anyone else notice any problems or check before installing?
Cliff

 

[PenMan]

Our dual is running good. I was reading numbers with hand held before adding the dual in line. They are running almost exactly the same as we are getting with the dual output meter. I do keep checking output with the hand held. I keep meaning to change the input to between the R/O and DI elements, but had not done it yet.