[SunShineCleaning]

AS a drop of water dyes  the particles of impurities in the water will move to the crest of the meniscus( the rounded top)  of droplet and avoid the sides.Plus the particles will concentrate from the water that has already dried. If one tested the droplet of water just before it dried you would find that its TDS would reach a higher volume of particles.Pushing the tds to 50/60 which would form a drop shape mark.

When water evaporates slowly the particles will be spread evenly over the glass and will not be seen by the eye.Hope this helps to understand your problem.
 
Your D I works as a safe guard working as quality controller on your water, Even if you feel you do not need a di its is wise to use one as the R O is less stable and can charge quickly if it is becoming worn out IF you do not need a DI it will cost nothing to run as it will use no reason but will be a safe guard. 

Good explaination.

[richard jagger]

Thanks mate, happy to help. Always though my education was wasted.

[smearo]

i have been getting some spotting to but only when direct sunlight on the window my tds is 000 ppm and my flow is high... one of my fellow shiner friends has said the same and he always runs on 000ppm and rinses for england

[richard jagger]

You could be getting some residual on the glass due to pollution in your area. Remember pure will not de-solve all pollution deposits on the glass after all is only water.The most difficult one is from cement which need to be burned off with acid or buffet of with a compound.From what I understand pure made from high tds water should clean better than low TDS as it has the nature need to return to what it was when it was high tds water.This pure I believe is more able to de solve more deposits and this is why some folk have this problem and some don`t. If my theory is correct, it would explain it all.I will run this by some who know more than me.By the way is your TDS high or low?
Smear this was for you.
I also believe you spotting is always there but is only visual in sun light.

[Frank pole]

Got a big job on in the morning - getting there for 4 to avoid the direct sunlight!

[Dave Willis]

I only work at night now to avoid the sun.

[Shiners Express Ltd.]

Window Washers, 50/50 split for waste to produce. Coming out of tap at 450ppm.

Have just reinstated a pair of old DI bottles, forgotten how fiddley it is to replace the resin. Found an unopen bag of resin in my shed and blow me down it's still giving 000ppm!!

See what happens tomorrow and will let you know!

Window Washer + Wizkid, Don't suppose you'd send me your e-mail address? info@shinersexpress.com  Might pick your brains a bit more if you don't mind?!!

Ben m, flush your RO by opening the flow valve up all the way so all water goes to waste and no produce. Leave it run for 10-15 minutes before turning valve in again. Good to prolong life of RO especially if you salt back wash regularly.

[Londoner]

Some windows seem to spot no matter what you do. And no matter how good the water is. I always get a few.

[richard jagger]

Vince as above."I also believe your spotting is always there but is only visual in sun light."

I also have some spotting I can only see when the glass is wet.I am going to use a random orbital sander with a sponge pad disk with Dr Power and then Brasso if need be and see if it does not improve I believe it will fix.

[richard jagger]

Shinners express The best way to get hold of me is to" FOA WIZKID me on here. If its not for forum ears . I will send you my e mail.

[ben M]

Window Washers, 50/50 split for waste to produce. Coming out of tap at 450ppm.

Have just reinstated a pair of old DI bottles, forgotten how fiddley it is to replace the resin. Found an unopen bag of resin in my shed and blow me down it's still giving 000ppm!!

See what happens tomorrow and will let you know!

Window Washer + Wizkid, Don't suppose you'd send me your e-mail address? info@shinersexpress.com  Might pick your brains a bit more if you don't mind?!!

Ben m, flush your RO by opening the flow valve up all the way so all water goes to waste and no produce. Leave it run for 10-15 minutes before turning valve in again. Good to prolong life of RO especially if you salt back wash regularly.

thanks shiners 

[EandM]

AS a drop of water dryes  the particles of impurities in the water will move to the crest of the meniscus( the rounded top)  of droplet and avoid the sides.Plus the particles will concentrate from the water that has already dried. If one tested the droplet of water just before it dried you would find that its TDS would reach a higher volume of particles.Pushing the tds to 50/60 which would form a drop shape mark.

When water evaporates slowly the particles will be spread evenly over the glass and will not be seen by the eye.Hope this helps to understand your problem.
 
Your D I works as a safe guard working as quality controller on your water, Even if you feel you do not need a di its is wise to use one as the R O is less stable and can charge quickly if it is becoming worn out IF you do not need a DI it will cost nothing to run as it will use no reason but will be a safe guard.

That's a cracking answer!!

[Window Washers]

my email address is design@windowwashers.co.uk I have nothing to hide my names Ian  


Ben to your reply, I turn a flush tap disconnect from resin first then turn on pump for 10 mins it then flushes over the membranes (this is on a 4040) I would recommend if you want it to last do this every fill some say don't but I disagree with them.

[Paul Coleman]

Thanks for your help Wizkid, in theory I completely agree with what you're saying, but it doesn't explain why we've never had this problem before!! Think i'm going to have to bite the bullet and go back to DI resin  

Must remember to ask the mrs if she'd like some meniscus later!!! lmao

Adding to what Wiz has said, if your RO isn't pumped but relies on mains pressure, many areas will be lowering the mains pressure if they haven't already.  This is to combat leaks in a drought.  Lower pressure usually means higher TDS from RO.  Also, that 25ppm could consist of anything.  It is worse with some dissolved solids than others.  If your area is pumping in water from elsewhere, the constituents of that 25 ppm may have changed recently.

[Dave Willis]

Shiners, you still got that Jack Russel in the van?

[richard jagger]

Paul  you have a point 25ppm does not say what`s it is made up of.That would change from area to area.Any ways fellows. I need to go to Oxford to deliver our findings on this  very important scientific finding.I am sure we will have to write a white paper on it.Or even a Nobel water prize ( a splash with a blond is a bath for one)

[CLEANCARE WC]

25 ppm on sunny days will spot.Those 25 particles are been concentrated in each droplet as they dry to quickly on a window.When the water dries slowly the particles are dispersed across the glass and not been drawn into the droplets.One can get away in a damp cooler weather with a 25 ppm but not when its hot and dry.Its quite logical if one just understands how it would work.

No offence WIZKID thats a load of crap.

[richard jagger]

So Clear clean you came on here last year and your already know it all.One GSSE does allow a opinion.Go on then you tell us why so many get spotting.Lets have a dose of your crap.I await with bated breath.The floor is yours.

[Perfect Windows]

You could be getting some residual on the glass due to pollution in your area. Remember pure will not de-solve all pollution deposits on the glass after all is only water.The most difficult one is from cement which need to be burned off with acid or buffet of with a compound.From what I understand pure made from high tds water should clean better than low TDS as it has the nature need to return to what it was when it was high tds water.This pure I believe is more able to de solve more deposits and this is why some folk have this problem and some don`t. If my theory is correct, it would explain it all.I will run this by some who know more than me.By the way is your TDS high or low?
Smear this was for you.
I also believe you spotting is always there but is only visual in sun light.

I like the look of most of your posts on this thread but I think this is a step too far.  Water has no memory (regardless of the homeopath nutters).  If it's pure, it's pure and it'll dissolve what it's used to wash regardless.  If you take your argument to its logical extreme, remember that every drop of water on the planet has been seawater, so it's all identical.

Vin

[andyM]

I can't understand some of the pseudoscience theories being put forward regarding the subject.
Its simple to understand that glass in direct sunlight at a reasonable temperature gets warm.
It is very likely especially with hydrophobic glass that water will start to evaporate or cease to sheet off the glass enough to clean off all the dirt particles in direct sunlight resulting in spotting.
The answer is to rinse these windows with much more effort and attention than is normally required.