Flicker,

Now one thing with higher CYA is that the chlorine added tends to be used up at a slower rate. You may have to chlorinate maybe once or twice a week. You will have to check and see how it goes.
Well, not really. Most folks on this forum have to add chlorine more frequently than once per week. The consumption of chlorine is dictated by organics introduced into the pool.

Secondly, the Sun will destroy chlorine if it is not protected with CYA so, in some repects, that would mean the Cl does get consumed at a slower rate but it seems a little misleading to think you may only have to replenish weekly or bi-weekly.