[Moderator David@stives]

When water moves through the DI resin beds, it can begin to wear channels, allowing untreated water to pass through the resin bed without being completely deionized. This results in water of "unknown quality" mixing with your DI water. Chemical changes in the resin beds can be caused by organic substances, excess chlorine, or high levels of oxygen in the incoming water supply. When the resin beds are fouled or oxidized, their exchange capacity is reduced, resulting in higher costs for your DI water.



RO water is chemically unstable. The RO membranes act to concentrate dissolved gases in the treated water, at a level 2 to 4 times greater than the incoming water supply, depending on its characteristics. This means that carbon dioxide variations in the incoming water are actually amplified during the RO process,  Another variation can result from storing the water in translucent plastic tanks with unprotected air vents, common on many RO systems. Light promotes biological growth, and the air that is introduced into the tank carries spores and organic matter that can promote contamination

[Moderator David@stives]

Graham i did not think you would be interested for one minute you seem to have the attention span of a plank of wood 

somebody might read it i would of not put it there otherwise .

please let me know if anyone reads it 

at least all that stuff is clearly understandable ,just like most of your posts realy

 

[kingfisher]

I’ve been car Valeting almost as long as I’ve been window cleaning.

I have been Valeting with filtered water since working with the water fed poles
I have never noticed any degrading of the cars polish in fact I would say the opposite is true
because I now don’t have to use any detergent to clean the cars, if you were to look at one of my regulars cars I am sure you would agree.

However I don’t use any brushes on my cars soft or otherwise they scratch believe me I’ve seen it.

And I still leather the cars off not because I’m wored about spots or runs but because I always find a small triangle of dirt left behind by the sponge.

The only motor I use a brush on and leave to dry without leathering off is my van

kevin