[tom20001]

for 250 litre tank guys?

what would be max ppm to make di only viable

thanks in advance

[Jonny 87]

The size of your tank doesn't matter.

Less than 100 ppm really.

Technically you can use 500 ppm with DI only, but it will cost you a fortune in resin.

If your ppm is higher than 100 then it will be much cheaper in the long run getting a ro.

[PurefectWindowCleaning]

My PPM is about 60, and is fine DI only...

I'd also say around 100 is the limit until you should really consider going the RO route.

[roundbuilder]

My PPM is about 60, and is fine DI only...

I'd also say around 100 is the limit until you should really consider going the RO route.

With 60 ppm what vessel/vessels are you using and how long does a sack of resin last??
After ro my water is around 37/42 and a standared medium vessel 6 litres i think only does around 3000 litres roughly from my head.
Cheers

[PurefectWindowCleaning]

My PPM is about 60, and is fine DI only...

I'd also say around 100 is the limit until you should really consider going the RO route.

With 60 ppm what vessel/vessels are you using and how long does a sack of resin last??
After ro my water is around 37/42 and a standared medium vessel 6 litres i think only does around 3000 litres roughly from my head.
Cheers

I use a 11 litre vessel, which lasts about 2.5 months roughly. We are only using WFP for upstairs and leaded windows mind

[dazmond]

my tap tds is 29-35 usually.great for DI only.

id go up to 200 tap tds with 2 massive 25L vessels(double DI) if i had to rather than buy an RO system as no room for one plus with di only its easy and fast to purify your water.

[Jonny 87]

my tap tds is 29-35 usually.great for DI only.

id go up to 200 tap tds with 2 massive 25L vessels(double DI) if i had to rather than buy an RO system as no room for one plus with di only its easy and fast to purify your water.

That's great water quality, whereabouts in the country are you?

[tom20001]

ppm is between 83 and 89 lads .......

will a di ONLY be cost efficient in this case?

[James Bulton]

A R O should bring it down to 8/9 whick would be fine to clean. But a di only will be perfect .

[Clever Forum Name]

Twin DI will be even better for you.

[tom20001]

A R O should bring it down to 8/9 whick would be fine to clean. But a di only will be perfect .

a di only will be ok then i take it

which di vessel should i go for, what is the advantage of bigger capacity  di .

 ie- a 6" x 18" 6.5 litre versus  a 8" x 35" 25 litre resin vessel?

[tom20001]

Twin DI will be even better for you.

why is that pure?

[andyM]

A R O should bring it down to 8/9 whick would be fine to clean. But a di only will be perfect .

a di only will be ok then i take it

which di vessel should i go for, what is the advantage of bigger capacity  di .

 ie- a 6" x 18" 6.5 litre versus  a 8" x 35" 25 litre resin vessel?

Definitely go DI, especially considering your parking situation you mentioned in another post.
So filling up your tank will be quicker than if using an RO.
I would say go double DI and use two 11 ltr DI vessels.
Anything bigger than that will take up too much room in your van.

[tom20001]

ok andy thanks for that

but what is the advantage of double di?

cheers

[andyM]

The resin will last longer by alternating the sequence of the vessels.
That's the theory.
I've never actually done it as im an RO user but im sure someone on here will advise you if you need further advice.

[tom20001]

thanks andy

as regards capacity of each di, 11 litre, 15 lite, 25 litre i take it the only difference with these is you have to fill them with resin less ofter with bigger ones and more with smaller ones, is that only difference as regards output of each?

[ascjim]

My water is around 130 - 150 ppm. I use about 700l a week and change the resin once a month.

So thats 11l of resin a month, so £69.00 every 3 months for resin. And I usually fill up at jobs so no big water bill.

I have it set up with tap water going into a 350l tank (20 mins filling time) and going trough the di as its being pumped out.

[ascjim]

forgot to say i have twin di

[tom20001]

My water is around 130 - 150 ppm. I use about 700l a week and change the resin once a month.

So thats 11l of resin a month, so £69.00 every 3 months for resin. And I usually fill up at jobs so no big water bill.

I have it set up with tap water going into a 350l tank (20 mins filling time) and going trough the di as its being pumped out.

fair play james thanks for that

i had intended to put water through di from mains and then into tank and then just pump to pole, this is ok i take it? im a novice u prob guessed

[ascjim]

That's fine. But you will need to run the water trough the di quite slow, especially when the resin starts getting to the end if it's life.

I put Tao water in the tank to save time each evening filling.

Tank > pump > di > reel

Just saves me so much time