tds reading

slant77 · 08-28-2007, 09:29 PM

Ok my reading going in is about 240 and now coming out is 33. It used to come out at 5 or below. Does this sound right for that high coming in? Are does this mean something needs to be replaced?

sea devil · 08-28-2007, 10:12 PM

Your level coming in is lower than mine, it's around 320. I also have a "GE WHOLE HOUSE" filter as a pre-filter to my RODI. Before I installed the GE filter my "in" level was well over 400. I'm on a well with a H2O purification system & I still have bad water. I couple of questions on the "out" level.
1) Do you have a "in-line" meter or hand held probe?
2) Do you check "out" levels as soon as H2O starts to flow from line?...or
3) After RODI has been off for a day or longer(not producing "clean" H2O), do you "BLEED OFF" the first few gallons before storing &/or testing "TDS" levels?

slant77 · 08-28-2007, 10:33 PM

ok I made a mistake incoming was 340 not 240. I test with a hand meter. I just did a little test buy letting the ro water into a glass measuring cup and got a reading of 0. Then I took a reading again on my holding container which is a rubbermaind trash can and got ready around 30. So I going to make a guess here and say that the trash can has something to do with the reading.

sea devil · 08-28-2007, 10:46 PM

It's always best if you "run off"/discard the first few gallons before collecting RO water. You'll always get high readings at "start up" Try this little test; next time you make up RO water, using a cup to collect with test the first cup that comes out. Then "run off" a couple of gals first. Then collect another cup full & test it. Levels will be significantly lower on second cup. Do you use the same can to collect RO water & to make up salt water? If so & you don't rinse the can out you'll get false TDS readings. Stick your TDS meter in your SW tank & see what kind of TDS levels you have...........OFF THE CHART!!!! JK about actually testing TDS levels in your tank. SUPM

BoomerMn · 08-28-2007, 11:05 PM

Stick your TDS meter in your SW tank & see what kind of TDS levels you have...........OFF THE CHART!!!!

Not mine, it works just fine in SW Goes to 0 - 100,000 ppm TDS

Loverotties · 08-28-2007, 11:20 PM

is your unit only RO?because you would get a zero reading with DI unit.

Ikaria · 08-29-2007, 09:56 AM

Quote:

Originally Posted by Loverotties

is your unit only RO?because you would get a zero reading with DI unit.

Not true. If your DI resins are depleted you will get readings higher than zero.

Loverotties · 08-29-2007, 10:33 AM

Quote:

Originally Posted by Ikaria

Not true. If your DI resins are depleted you will get readings higher than zero.

Depleted is the same thing as not having one!

Ikaria · 08-29-2007, 03:31 PM

Quote:

Originally Posted by Loverotties

Depleted is the same thing as not having one!

It's not the same. Depleted means it still has some usefulness. You could have an r/o output of 15, and a d/i output of 5, which means that the d/i resin is depleted not expended.

Expended would be the same as not having a d/i. There is a difference.

Goldstripe · 08-30-2007, 05:24 AM

Quote:

Originally Posted by Ikaria

It's not the same. Depleted means it still has some usefulness. You could have an r/o output of 15, and a d/i output of 5, which means that the d/i resin is depleted not expended.

Expended would be the same as not having a d/i. There is a difference.

I concur. My RO out is at 5ppm with inline meter. DI is reading 1ppm out which I'm still calling acceptible. What do you all think? Is 1 still ok? I would tend to think so but want some input. DI resin is so expensive

Robwsup · 08-30-2007, 08:36 AM

Get a refillable DI canister. We repack them for customers for $9.

Goldstripe · 08-30-2007, 10:15 AM

Quote:

Originally Posted by Robwsup

Get a refillable DI canister. We repack them for customers for $9.

Yep, that's what I did with you last time Rob remember? The first refill I bought is showing 1ppm now. Time for the 2nd?

Ikaria · 08-30-2007, 11:02 AM

Quote:

Originally Posted by Goldstripe

Yep, that's what I did with you last time Rob remember? The first refill I bought is showing 1ppm now. Time for the 2nd?

At 1 ppm I would keep on running it. I look to replace my d/i between 3 - 5 ppm. This is just me though.

Robwsup · 08-30-2007, 11:42 AM

I do 3-5ppm.

slant77 · 09-08-2007, 11:10 AM

ok I did a test in a glass jar the first half gl had a reading of 1 by the one gl mark it was 0. This is starting with a ro unit that has sat for a week. I do use the same container that I mix the salt into. So does this mean I have to make the water then pump into an different container to mix in the salt.