Filling tank with tap water and running through double di

[Max10240]

Hi all. I’ve recently started my own window cleaning company after 10+ years of working for other companies.

I’m currently filling the tank in my van with tap water (70ppm) and then running through two di vessels then through my hose. Is this the best way to do it, shall I fill the tank itself with the water through the double di?

Many thanks

 

[Part Timer]

Best to fill after DI, resin might fail so you might be washing windows with 70ppm water