[Wc Solutions]

just seen this post. ive been a little experiment this month with water starting at 30 and now upto 67.

all on regular cleans and not one problem, even in this direct strong sunlight.

[SPE]

had this question been asked a few years ago on here, most would have gone into a state of panic and changed asap at 002 ! mostly I've changed the resin at 010, but beginning to think 12-15 from an ro is sufficient, is resin really needed ?

[barry mallett]

I stopped using resin this winter . October I think . My tap tds drops to about 65 .started using it again in may when it goes up to 120 .no complaints and will try again as soon as it drops down to 65 again . Di only .

[koopmaster]

i spoke to 2 other window cleaners (they where employed though) and they said go up to 100 but I stay at 002 and used to change at 10.  but mine is at 15 and holding, I suspect the resin has gone. 

my carbon filters are also moldy but I have new ones coming next week so will change the resin at the same time. 

Next year I am changing to having a 40 40 and a hs5 in my van to make life a little easier.

[ants]

I did my own windows with 035 in pouring rain,the next day in full sunlight they were perfect.

[formb]

000

Use double DI then you never need to go above 0 and it won't cost you any more in resin. Then when you are explaining to a customer how your wfp system works, you can tell them the truth.

[roundbuilder]

But in scotland you have the purest of water so hard not to get 000. Lucky git!!! :-)

[jimiwindows]

0.00

[gary999]

the real truth is whatever works

on new estates local to me i use tap water which ranges
from 58ppm to 102ppm which it is at present and they dry
perfect everytime.

in other areas i use my ro water 9ppm no problems