[Mike 108]

Tested TDS this morning - 82 ppm
Changed resin. TDS now 112 ppm

Was warned that reading might be high at first but would come down to 0 ppm as more water was run through.

Why is this and how much water needs to be run through.

Thanks

Mike

[AuRavelling79]

Something weird here.

What is your set up?

Tap water reading?

Is there an R/O?

Are the seals tight?

[pjulk]

are you using one of those 10" di vessels if so have you put it back together correctly.

Paul

[Luke Johnson]

you may have filled the vessel up too high, I know this can cause problems.....have you seen my wfp 1960s pictures?

[Mike 108]

Malc/Paul

The Di unit is 18" tall

No Ro unit (soft water area)  tds usually 0 ppm

The tap water has tds reading of 112 (just checked it)

Water coming out of Di unit is also 112 (reading in subject heading must have beeen a typing error!)

I can't see how I could have put the Di unit back together wrong - it wouldn't fit together any other way

[Mike 108]

Luke

When I first got the Di vessel (from a friend) there was an air gap at the top - I thought that maybe the resin had 'settled'

When I filled it up today, I filled it right up to the top!

Why do think that might cause a problem?

Mike

[Mike 108]

There is a 'sponge' inside the resin tube. Does it go at the bottom (underneath the resin) or at the top (on top of the resin).

Thanks

[Alex Wingrove]

the sponge goes at the end where the water comes out to stop the resin passing through the pure water

[DASERVICES]

Your DI vessel is too small you need one of these:- http://www.gapswater.co.uk/acatalog/vessels.html

The one you have only works with an R/O

[macmac]

I have 2 11" di vessels, there is no sponge in either of them & they've run 100% for over 3 years. no resin can get through a di vessel unless you connect it back up the wrong way, i.e. there is an in & out.
Never fill it right up to the top with resin, it should be filled 3/4 only.

tony

[Mike 108]

Macmac

I didn't know that.  I'll take some out tomorrow and see what happens to the tds reading.

Thanks

[macmac]

Macmac

I didn't know that.  I'll take some out tomorrow and see what happens to the tds reading.

Thanks

If there is no IN/OUT marked on your di vessel top, take a close look & study it's workings & it will become clear which way the water should flow.

tony

[Mike 108]

Macmac/Alex

There is an 'In' and 'Out' marked.

I'll take out some resin tomorrow.  Will also investigate to see if the sponge can go anywhere different to where it is now.

Thanks

Mike

[JM123]

Hi mate, you're using far too small a vessel.  you need 2 11ltr+ vessels.  a 750ml vessel just can't di the water that fast, plus it'll burn out after 15ltrs maximum.  If you use 2 11ltr vessels then a bag of resin will last for about 21000ltrs.

[macmac]

Hi mate, you're using far too small a vessel.  you need 2 11ltr+ vessels.  a 750ml vessel just can't di the water that fast, plus it'll burn out after 15ltrs maximum.  If you use 2 11ltr vessels then a bag of resin will last for about 21000ltrs.

I'm confused, he says his di vessel is 18" tall

tony

[JM123]

oh, sorry - slight reading mistake on my part, thought he said it was 10inches but sorry its 18 inches (no funny jokes please)


ignore my last post.


in fact, just forget I was ever here!

[macmac]

oh, sorry - slight reading mistake on my part, thought he said it was 10inches but sorry its 18 inches (no funny jokes please)


ignore my last post.


in fact, just forget I was ever here!

but what about the sponge JM? i've never heard of a sponge in a DI.

tony

[JM123]

well you see tony that was what threw me - I just seen 10" in one post and sponge in another and automatically assumed a 10inch ro-man refillable vessel (750ml)  those are the only ones I know of that have sponge in them.

We only stock structural and dekal di vessel, neither of which has sponge.

[KarlJones]

Inspired by this thread I decided to see what happens to TDS after it has gone through the sediment and carbon filters.  The idea was to see if guys that can half justify using DI systems with no RO could benefit from using carbon and sediment filters...

Well my TDS prior to any filtering was 247,  after filtering it was 246.

So no, my thoughts that you might be able to use carbon and sediment filters prior to the DI and cut cost were wrong.  But thought I would post it anyway just incase you were wondering.

[*foxman]

Good test. It shows that the membranes do all the work and you need the prefilters to protect them from clogging.