[g.brookes]

Quick question chaps.  I live in a soft water area- about 30 ppm and at the moment I just use DI and that works fine.  But im shortly going from using 100 litres a day to about 300 litres a day.  Would it still be cheapest for me to use  DI only or would an RO setup save me more money?
Cheers

[gto]

DI only is all you need

[gary999]

if you arent on a meter i would get a ro,my tap water is 64ppm at mo and has been as low as
48ppm my ro filters and membrane lasted over 4 yrs without changing them

but with all the concern over water at mo maybe stick to di you wont have gallons
going down the drain every day

[g.brookes]

ok cheers fellas

[richard jagger]

What one needs to sum up what cost more reason or water say over a month.P O and DI will always be best. Your membranes would last forever and reason would just cost nothing.The more stages you have in a system the cheaper it would run per litre , the more membranes( max 3 membranes  then it become a waste of money) the least waste water.But a R O does produce waste water.

[♠Winp®oClean♠]

DI only IMO.

Who in their right mind would invest in an RO, IBC tank, transfer hose etc + storage & the problems winter will bring to it with a tap TDS of 30ppm? :

You could clean with water at 30ppm & not even purify it. 

I worked with 40ppm for a whole week & not one spot was visable!

I would have 2 x 11ltr DI vessels on your van. Fill tank with tap water & prify on-demand, your resin will last ages, you'll be able to fill the tank from any source & you'll have ZERO hassle!

[alanwilson]

30ppm I'd go twin di as well.

[Window Washers]

sorry I read it wrong, My mistake using that little amount twin di.

I hold my hands up I read the post wrong 

winpro 

[alanwilson]

Even at 30ppm a bag should still purify 20,000 litres or so of water.

For someone using 1500litres a week you are still only looking at buying 4 bags a year.

[Window Washers]

Even at 30ppm a bag should still purify 20,000 litres or so of water.

For someone using 1500litres a week you are still only looking at buying 4 bags a year.

long term (which if hes wanting an ro would save him money, but if hes staying at only that amount then di)

[♠Winp®oClean♠]

Even at 30ppm a bag should still purify 20,000 litres or so of water.

For someone using 1500litres a week you are still only looking at buying 4 bags a year.

2 bags a year with twin vessels.

[♠Winp®oClean♠]

sorry I read it wrong, My mistake using that little amount twin di.

I hold my hands up I read the post wrong 

winpro 

Nothing was aimed at you mate (for a change!)

[g.brookes]

thanks for the replies.  why would i want twin di vessel rather than just one?  Also, i live in a flat so i have to do my filling up at my parents, meaning i need a storage tanks and a transfer hose anyway

[♠Winp®oClean♠]

thanks for the replies.  why would i want twin di vessel rather than just one?  Also, i live in a flat so i have to do my filling up at my parents, meaning i need a storage tanks and a transfer hose anyway

Because when vessel 1 starts to rise in TDS, you use it to pre-filter vessel 2 filled with fresh resin instead of throwing it away. So your fresh vessel is now being fed water at 001/002 PPM instead of 30 PPM. You keep the cycle going then.

If you have the vessels on the van you can fill the tank with tap water & pump through the vessels to purify on-demand. This means no storage tanks etc + you can fill up anywhere & even top up mid-day if you are running low. The slower the flow through the vessels the longer the resin lasts also. Been doing this for 8 years with a tap TDS of approx 90ppm.

[♠Winp®oClean♠]

I've just modified that post, wrote it wrong.

[g.brookes]

wow, interesting idea.  if you just have tap water in the van, and then it goes through the DI straight up to the window, is the flow rate not slowed/ the resin runs out really fast?

[♠Winp®oClean♠]

wow, interesting idea.  if you just have tap water in the van, and then it goes through the DI straight up to the window, is the flow rate not slowed/ the resin runs out really fast?

No, the opposite.

If you fill your tank "through" the vessels i.e. filling the tank with "pure" water then this is a much faster flow through the vessels (unless you slow it down, then you have a slow fill time).

If you fill the tank direct from the tap & NOT through the vessels, then you have a much slower flow going through them- whatever your desired flow rate is to the brush.

Result- resin lasts longer, only tap water in tank so you can dump at will (weekends for example), you can fill it faster with full mains pressure, you can fill it from any tap etc etc etc.

With your tap TDS, twin 11ltr vessels & Tulsion MB115, trust me, resin cost will not be an issue. I'm running a 400ltr van mount with a tap TDS of 90 PPM, I work full time & use 3 bags of resin per year.

[g.brookes]

ok so just to clarify, i could have the tank full of tap water, and run the water from the tank through the vessels upto the window whilst maintaining 35-40 flow on the digital varistream (out of 100)?   no more questions today i promise

[dazmond]

my tap tds is also around 30-35.i use around 2 bags of resin a year.5000-6000L a month roughly.im on a meter so DI only is best.pretty much hassle free as well as fast to purify for the next days work!

works out about £3-50 a week for resin!well worth it for me!

[♠Winp®oClean♠]

ok so just to clarify, i could have the tank full of tap water, and run the water from the tank through the vessels upto the window whilst maintaining 35-40 flow on the digital varistream (out of 100)?   no more questions today i promise

Yes, exactly!

You could run the pump at 100 & it would still purify at 000ppm & still be a slower flow through the vessels than mains pressure.

Start off with one vessel until it begins to read 001/002/003 etc, THEN, add the second vessel full of fresh resin after the original vessel. So, you'll now have, in this order-

Tank>pump>vessel 1 (older resin)>vessel 2 (new resin)>hose reel>pole.

When the newer vessel (number 2 above) starts to read 001/002/003ppm, move it to where vessel 1 is. Remove vessel one (oldest resin) & fill it with fresh resin, then put it back where vessel 2 was before. You've just got rid of the oldest resin (original vessel one) that you would have had to throw away ages ago if you were to use just one vessel.

It works in a cycle now, swapping the vessels back & forth, so you're always pre-filtering your newest resin with your old (which is still actually purifying water)

NOW, with my tap water being 90ppm, the old resin never gets this high before the newest needs changing anyway BUT, with tap water at 30ppm you'll have to keep an eye on it, as you don't want the tds in it going higher than the water that it's purifying.

It's very simple in practice & an obvious solution once you get your head around it.