[Griffus]

My tds had just started creeping up after going through both RO and DI. It was about .002 but as I've had the system since April last year I thought fair enough.

Bought a bag of Tulsion as recommended by many.

Just swapped old for new and expected an instant zero.

I am gutted as it's now .007.

What could I have done wrong, or what should I have done that I haven't?

Thanks in advance

Ian

[Dave Willis]

Got the cap on the right way round? Check the arrows.

Is the container clean that you do your readings in?

[Dean Taberner]

Have you let the water run through it long enough?

[Griffus]

Got the cap on the right way round? Check the arrows.

Is the container clean that you do your readings in?

Hi Dave, thanks for your reply.

I am pretty sure it's on the right way as the hoses are braided and bent into shape.

I'll double check though.

Forgot to mention that I tried a couple of clean cups just in case.

[Griffus]

Have you let the water run through it long enough?

Hi Dean, I did wonder.

Ran through for 2 or three minutes after changing.

Tank filling up at mo but will run for longer later.

How long do you recommend?

The water was clear to start, then went like milk, the appeared clear again, though this was when the tds was .007

Thanks again.

[dave0123]

how big is the DI bottle, have you put enough resin in the bottle?

[Griffus]

Quite big, 10 or 12 litres I'd guess.

Filled about 3/4 full.

[dave0123]

fill it up to where the neck starts to curve at the top. then bang it all down on the floor, then reconnect

[wfp master]

fill it up to where the neck starts to curve at the top. then bang it all down on the floor, then reconnect

+1 pack the resin in.

[Griffus]

Will do, thanks guys.

[formb]

DI bottles are not bullet proof. You need to check that the seals are all seated correctly, also that the riser tube is not oval at the top.

[home6442]

Need to check what the tds is coming from your R.O. might not have anything to do
with the D.I.

[mark dew]

How often do you flush your RO unit?
If the resin hasn't brought it down then the next step is to change the filters.
But they just might need a good flush and to do it on a regular basis.

Filters are cheap enough to replace if flushing 1st doesn't lower the tds.

[Griffus]

Need to check what the tds is coming from your R.O. might not have anything to do
with the D.I.

Usually between 70 and 80 from RO.

Was a bit against the clock earlier. Will check in the morning, cheers.

[Griffus]

How often do you flush your RO unit?
If the resin hasn't brought it down then the next step is to change the filters.
But they just might need a good flush and to do it on a regular basis.

Filters are cheap enough to replace if flushing 1st doesn't lower the tds.

Flush once a week for at least 30 minutes.

Pre-Filter changed a couple of weeks ago so can't be that.

From what I've read it looks like maybe I didn't run through enough but mainly that I need to add about anothe 2 litres of resin.

Thanks to all that have posted.

[Mike55]

DI bottles are not bullet proof. You need to check that the seals are all seated correctly, also that the riser tube is not oval at the top.

Hi,

That's an interesting point - where and how tight should the seals be?  I can remove the riser tube from the cone at the top of the DI vessel quite easily.  There isn't any rubber seal at the point of entry and I have noticed that I seem to be going through resin quicker than expected.  I'm wondering whether any ro water only is contaminating the DI water giving the false impression that the resin is spent.  Should there be a water tight seal there?

Any advice appreciated cheers

[Griffus]

Update

Added about 4 to 5 litre jugs of resin. Cylinder now 90% full.

TDS after 15 minutes of running through the DI is flickering between 2 and 1. After always having zero I find this a little unsettling, especially as this is new resin, and the pre-filter was only changed a couple of weeks ago.

TDS from tap is the lowest I've seen it at 253 (could this be down to the hot weather).

TDS in the tank after RO is 48.

TDS in several different clean cups between 1 and 2.

Is it possible that this will sort itself after a bit more water passes through it? If not what can I do?

As always, thanks

[Dave Willis]

Don't Tulsion do several different kinds of resin?

I've always used 115 - never had a problem with it. Maybe try someone elses tds meter too?

[Spruce]

Update

Added about 4 to 5 litre jugs of resin. Cylinder now 90% full.

TDS after 15 minutes of running through the DI is flickering between 2 and 1. After always having zero I find this a little unsettling, especially as this is new resin, and the pre-filter was only changed a couple of weeks ago.

TDS from tap is the lowest I've seen it at 253 (could this be down to the hot weather).

TDS in the tank after RO is 48.

TDS in several different clean cups between 1 and 2.

Is it possible that this will sort itself after a bit more water passes through it? If not what can I do?

As always, thanks

If the tap water is 253 and the output after r/o is 48, then there is a problem with your r/o membrane/s.  On those figures your r/o is only working at 81% efficiency. Most r/o's work at between 96-99% efficiency unless you have a Merlin that runs at around 90%.

At 253ppm you should be down to around 5ppm after r/o.

Changing prefilters won't make any difference to your tds (ppm) output.

[david wood]

I bought a 4040 ro in march tap water is 185ish. after ro it was on 5 then checked it the other day and its jumped to 13 flushed every week but only just changed my filters