fg,
The iCHLOR is only rated for a 30K pool... We always recommend that a salt cell be at least 2 x the volume of your pool... This is because cells are rated when running at 100% output and 24/7..
Your pool builder is doing you no favors by recommending the iChlor... I am sure, when it can't keep up with the FC demand in the middle of the summer, he will tell you he never liked SWCG pools anyway because they are so much trouble...
Thanks,
Jim R.