[FRESHER]

What TDS reading would you say is the threshold between DI / RO?  I guess if you are in a soft water area, do you take into account fluctuations in TDS? Thanks 

[Tom White]

Are you saying, at what TDS level at the tap would we use for RO/DI, rather than just a DI alone?

If you are, I don't know the answer, but I thought I might help try and clarify your question.

[FRESHER]

Hi Tosh,

Sorry if that was confusing.  You are right, at what level of TDS from the tap would you use RO instead of just DI.

Thanks.

[Tom White]

It might help if you tell us your what your tap TDS is too?

[Richy L]

Tosh, do you use an RO or DI? Is your tap around 220ppm?

[SeanK]

My tap TDS is around 220ppm I need both to get the water to zero.

[Tom White]

Tosh, do you use an RO or DI? Is your tap around 220ppm?

I use an RO/DI and I think my tap water is around 180 ppm.

[FRESHER]

My Tds is 75

[Richy L]

Im using two DIs to get to 000, but its not lasting very long.

[Tom White]

Im using two DIs to get to 000, but its not lasting very long.

It won't with a TDS of 220.  I use a 300 gal per day, RO, (or it could be 200; not sure) and it easily produces about 500 liters per day; more in the Summer (cold weather slows it down).

It's very cheap to run; one bag of resin every few years.

[Richy L]

Im making around 500 litres a week and a bag is lasting around 2-3 months.
I need to get an RO!

Whats the waste water like on them though?

[Tom White]

My Tds is 75

I think Soupy might be best to advise you; he lives in a soft water area and uses DI only.  Or is it another member?  I can't remember.  It's my age.

DI has it's advantages; you can just fill up from a tap into the van's tank, and pump the water through your pole via a DI.  So any tap will do you.  You could also travel some distance to a job empty, and fill up at the job (less wear 'n' tear on the van).

Since I use a RO/DI, I have to make it into a 1000 litre tank in the garden, and then transfer it from that tank into my van.

How much water do you use a day?  If it's a lot, you may be best going RO/DI.  If you're new to window cleaning and not got many customers, you might find DI only is the best way to start and go RO/DI later.

Hopefully Soupy will give some firmer advice.

[Tom White]

Im making around 500 litres a week and a bag is lasting around 2-3 months.
I need to get an RO!

Whats the waste water like on them though?

Quite high.  I don't know exactly.  Maybe 3:1 ratio of waste.  Maybe even higher? 

[ChumBucket]

Posted by: FRESHER   Posted on: Today at 10:50:30 pm
Insert Quote
My Tds is 75

You need two 11Ltr DI vessels, in sequence on the van to pump through & fill tank with tap water. Given your above details, a bag will last you much longer than it is now. My tap tds is 90ppm, I generally use approx 300 to 400 Ltrs a day & a bag of resin lasts me 3 months, sometimes longer. I wouldn't even entertain an RO with your water.

[Tom White]

Im making around 500 litres a week and a bag is lasting around 2-3 months.
I need to get an RO!

Whats the waste water like on them though?

You need two 11Ltr DI vessels, in sequence on the van to pump through & fill tank with tap water. Given your above details, a bag will last you much longer than it is now. My tap tds is 90ppm, I generally use approx 300 to 400 Ltrs a day & a bag of resin lasts me 3 months, sometimes longer. I wouldn't even entertain an RO with your water.

I think you're mixing Richy L up with Fresher.

Richy's TDS = 220
Fresher = 70

And it was you I was thinking of, not Soupy.

[ChumBucket]

Im making around 500 litres a week and a bag is lasting around 2-3 months.
I need to get an RO!

Whats the waste water like on them though?

You need two 11Ltr DI vessels, in sequence on the van to pump through & fill tank with tap water. Given your above details, a bag will last you much longer than it is now. My tap tds is 90ppm, I generally use approx 300 to 400 Ltrs a day & a bag of resin lasts me 3 months, sometimes longer. I wouldn't even entertain an RO with your water.

I think you're mixing Richy L up with Fresher.

Richy's TDS = 220
Fresher = 70

And it was you I was thinking of, not Soupy.

Aye you're right.

Above applies to Fresher then & Richy needs an RO!!

[Richy L]

What RO do I need? I dont want to spend too much on this as my work is mostly pressure washing, etc.
As mentioned, I only need around 450 litres a week.

[FRESHER]

Thanks chum bucket, although I was really looking for the Tds where you start to think about RO., where are you based?

[Mike #1]

Posted by: FRESHER   Posted on: Today at 10:50:30 pm
Insert Quote
My Tds is 75

You need two 11Ltr DI vessels, in sequence on the van to pump through & fill tank with tap water. Given your above details, a bag will last you much longer than it is now. My tap tds is 90ppm, I generally use approx 300 to 400 Ltrs a day & a bag of resin lasts me 3 months, sometimes longer. I wouldn't even entertain an RO with your water.

My TDS ranges from 40 to 75ppm and I use an RO but I have room for a static tank at home , I have used double DI method but did not see the point of spending over £320 a year on resin when their was no need when an RO can be bought  for about £180 .

You could buy a static tank an Ro and transfer pump and hose for about £400 and you don't have check ads all the time or mess about changing resin which I found a real pain

[Positivity]

An important factor is if you're on a meter or not.
There is considerable waste with an RO that has to be factored in.
DI only no waste but costs more in resin.
The general guideline is Soft water up to 100 DI only usually most cost effective (if you're on a meter).
Above 100 RO recommended.
AFIK.