Di or still buy?

[Reach For The Glass]

Hi guys

Ok just after a bit of advice please.

Currently buy my pure at 5p a litre. Very convenient as only 10 minutes away, i use roughly 800 - 900 litres a month.

Cost is around  £45 x 12 = £540 a year.

I have no space at all for a static system. 

Not on a meter.

Ppm is around  340ppm, london is 'ard.

Any ideas how much this will cost if i went down the onboard di route.??

Questions 

How many vessels needed?

Size of vessel?

How much in resin?

How much is the setup?

Also finally, can i fill my tank with tap water and pump straight through vessels to get pure on demand. Or is it tap to di and fill tank with pure.

Cheers guys

 

[KWClean]

Oh dear, I have not cleaned windows for 10 years due to an operation that went horrible (thinking about starting as I feel better than I have in a decade) and I am going to be giving technical advice.  This can not end well, so remember bad advice is worse than no advice, and this might be bad advice so please check with others as my info might be well out of date.

I am going to miss out the various RO configs, because you are sounding like hooking up hoses to run throughout the night filling your van would be difficult.  If it would not be difficult then consider it.  But back tot he question.

As a rough guide. 

At 50 tds sack of resin can clean 14,000 litres of water.  But every time you double the tds the amount it can clean halves. 

So, at 100 tds it can clean 7,000 litres of water.

At 200 tds it can clean 3,500 litres of water.

At 400 tds it can clean 1,750 litres of water.

At 350 tds it is going to be something like 2000 litres

You will be able to get these figures up a bit by using two Di filters, and doing the trick of when 2nd one goes above 000 you then swap them, and refill the one that was the 1st in line.  The idea here is that the 2nd Di in line was not totally depleted and can pre filter the water if we put it 1st in line and use new resin in the one we are making 2nd. 

Yes you should be able to pump through two of them in line no problem. 

As for the size, well you are going to be replacing Di a lot, so it makes sense to use the biggest two you can afford.

This is where the question... "Di or still buy?" gets a tad tricky,  You are spending £45 a month.  If you went Di you could probably pull that cost down a bit to be honest, maybe slightly cheaper.  You would have to fork out for at least two 11ltr Di and do the swap trick to really justify it I would think.  But for convenience, as long as your going to keep resin in stock, it might be better.

What is your set up as far as tanks go and pumps?  This might help the decision.

 

[spruce]

Oh dear, I have not cleaned windows for 10 years due to an operation that went horrible (thinking about starting as I feel better than I have in a decade) and I am going to be giving technical advice.  This can not end well, so remember bad advice is worse than no advice, and this might be bad advice so please check with others as my info might be well out of date.

I am going to miss out the various RO configs, because you are sounding like hooking up hoses to run throughout the night filling your van would be difficult.  If it would not be difficult then consider it.  But back tot he question.

As a rough guide. 

At 50 tds sack of resin can clean 14,000 litres of water.  But every time you double the tds the amount it can clean halves. 

So, at 100 tds it can clean 7,000 litres of water.

At 200 tds it can clean 3,500 litres of water.

At 400 tds it can clean 1,750 litres of water.

At 350 tds it is going to be something like 2000 litres

You will be able to get these figures up a bit by using two Di filters, and doing the trick of when 2nd one goes above 000 you then swap them, and refill the one that was the 1st in line.  The idea here is that the 2nd Di in line was not totally depleted and can pre filter the water if we put it 1st in line and use new resin in the one we are making 2nd. 

Yes you should be able to pump through two of them in line no problem. 

As for the size, well you are going to be replacing Di a lot, so it makes sense to use the biggest two you can afford.

This is where the question... "Di or still buy?" gets a tad tricky,  You are spending £45 a month.  If you went Di you could probably pull that cost down a bit to be honest, maybe slightly cheaper.  You would have to fork out for at least two 11ltr Di and do the swap trick to really justify it I would think.  But for convenience, as long as your going to keep resin in stock, it might be better.

What is your set up as far as tanks go and pumps?  This might help the decision.

Not a bad estimate according to the resin calculator. I tip my hat in respect.

http://www.windowcleaningwarehouse.co.uk/resin-calculator.html

Here's another calculator that a little more strict

http://www.gardinerpolesystems.co.uk/Resin_Calculator.htm

Double di will help reduce those costs a little.

At that usage you will be using a bag of resin every 8 weeks @Reach For The Glass. TBH I think you aren't quite there yet with monthly usage so would tend to continue buying water as the chew on producing it isn't worth the effort.

The thing is that using resin to purify water with a high tds is never going to be cost effective. If your demand increases then so will the cost of buying water, but you will also be earning more. Where the saving will be later is in purifying water with an r/o. If you haven't the space then you have very little other choice than to continue to buy it in.

 

[Reach For The Glass]

Cheers guys. Can i opt for onboard ro? Whats the matgs on this option? 

Thanks

 

[AGlassAct]

Karl - that's a cracking reply!
My input - onboard RO could be a good long term option, but you need to factor in where the waste is going to go and how you are going to shut off the tank when it's full etc, etc.
Yet again I agree with the Spruce. £45 a month is nothing for a hassle free fill up and go option for now until you consider all the other options.


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