[Suffolkcleaners]

Hi guys
Does anyone twin di when making there water? I’m a little confused. I have recently upgraded from a 4.6 litre to an 11 litre vessel. I then for the first time twinned then up once the TDS got too high on the single vessel....:

To my surprise it has lasted no longer whatsoever. The TDS did start back at 000/001 but within just a few filled tanks it’s now shot up to 012. What is actually the point? Have I missed something?

So just to confirm I am using an 11 litre vessel and twinned up my old 4.6 litre to it once the 11 litre TDS creeps up.

Cheers for any comments in advance.

[Bungle]

Two 11L vessels works well, it did when I was DI only. This is the way to twin DI. Use one DI and when that DI starts to creep up keep it as your first DI. Add the second DI AFTER this DI. Your TDS going into the second DI will be a lot lower than your tap water which will mean your second DI will last longer. When your TDS starts to creep up again put your second DI first and change the resin in your original first DI and put that as your second DI.

Rinse and repeat.

[Suffolkcleaners]

Hi Bungle

Thanks for your response. I’m making the water through a RO and then di to finish off. So it should work by twinning both my 11 litre and my 4.6 litre? So now the TDS has creeped up after using the 11 litre and then connecting to the 4.6 litre are you now saying I should revert back to the 11 litre Di only? And then back to twinning them both together? Have I got that right?

Cheers

[Suffolkcleaners]

Hi Bungle

Thanks i’ve just read again your comment. Bear with me as taking it all in Lol. So now I’ve used both Di vessels what you are saying in my case is to now change the resin in the original Di I used (11 litre one) but start again but this time around use the smaller Di as my first Di?

I’m still not seeing how I’m saving on resin? I’ve already used as much resin twinning them both up than if I had just used an individual 11 litre and then an individual 4.6 litre.

[mjm]

make sure you shake the bottles  frequently

[Bungle]

Your original post didn't mention an RO. I thought you were using tap water through your DI's. What is the RO bringing the TDS down to? You shouldn't need twin DI with an RO. Unless your RO isn't working efficiently? Have you tried using new resin in your 11L DI and hook that up to your RO?

[Suffolkcleaners]

Cheers mjm. I had no idea shaking them was something I needed to do.

[Splash & dash]

What reading have you got coming out of your RO

[Suffolkcleaners]

Hi Bungle
My error. Yes RO then DI to finish off. I think from memory it comes out the RO around 20 TDS and then the DI brings  it down to 000.

I don’t necessarily need to twin Di but as I had the 4.6 litre as a spare I was told by the guy who sold me the bigger vessel that I should twin them up to save on resin.

[mjm]

Cheers mjm. I had no idea shaking them was something I needed to do.

shake them like a barman shakes a cocktail   shaker 

[Suffolkcleaners]

A bit like Tom cruise in cocktail 😂

[Suffolkcleaners]

It seems to me that the guy who advised me to twin them up didn’t realise i was RO then DI. He might have thought I was DI only. Even so does it still not save on resin twinning them up?

[Suffolkcleaners]

Now I’m doubting it is 20 after RO. I’ve got a pure freedom 450 gpd and it takes about 24 hours to painfully produce around 400 litres. Water in Suffolk is ridiculously hard. Like 400 + TDS.

How do I check what my TDS is after RO? Let’s start with that first.....

Does that make a difference to twinning up the Di vessels? Thanks for your patience 😂

[֍Winp®oClean֍]

You're not going to really benefit with such a low input TDS. You only benefit upto the source TDS value, so the lower this is (20ppm here) the less there is to gain by doubling the DI's.

[Suffolkcleaners]

You're not going to really benefit with such a low input TDS. You only benefit upto the source TDS value, so the lower this is (20ppm here) the less there is to gain by doubling the DI's.

Thanks Winpro. I think the key is to find out what my reading is after RO. I could be wrong on the 20 TDS. How do I test the reading after RO?

If this is low after RO (quite possibly) then that explains why the resin I’ve used is no better twinning them than  when I used a single one. Like you said the reading could be too low to benefit from twinning them. I best confirm that though

[KS Cleaning]

Now I’m doubting it is 20 after RO. I’ve got a pure freedom 450 gpd and it takes about 24 hours to painfully produce around 400 litres. Water in Suffolk is ridiculously hard. Like 400 + TDS.

How do I check what my TDS is after RO? Let’s start with that first.....

Does that make a difference to twinning up the Di vessels? Thanks for your patience 😂

Disconnect the hozelock fitting before it goes into the DI vessel

[Bungle]

Now I’m doubting it is 20 after RO. I’ve got a pure freedom 450 gpd and it takes about 24 hours to painfully produce around 400 litres. Water in Suffolk is ridiculously hard. Like 400 + TDS.

How do I check what my TDS is after RO? Let’s start with that first.....

Does that make a difference to twinning up the Di vessels? Thanks for your patience 😂

You have a TDS meter? If you have one fill a cup of RO water before it goes into the DI and test it. You can buy in-line TDS meters but I think that buying one is a bit further down the road for you at the moment.

[Suffolkcleaners]

Cheers. Let me try that tomorrow and will post again once I get my ‘After RO’ reading 👍

[Suffolkcleaners]

Hi Bungle

Yep got TDS meter of course. I just need to work out how to test the water before DI (or after RO). KS said just to disconnect hozelock on Di. Will report back tomorrow if I get stuck which I probably will hahahaha

[Bungle]

You might want to look into investing in a 40/40 RO. 400L in 24 hours, your RO must be running flat out? A 40/40 will produce around 300L an hour with a booster pump.