Either way in your case. The Sun always burns up some Cl...less in your case because of the CYA of 90.

That said, I am such a cheapskate, I add my Cl in the evening to get the most bang for my buck.

As a learning tool, go ahead and put it in ASAP. Then, test your Cl at dusk this evening. See what you've lost during the day and add enough to get right back to 25.

Next, get up early tomorrow AM (watch out for those adult beverages during this Memorial Day ) and test your Cl again......comparing your daytime loss to your nighttime loss. In your case, it may not be that much difference.

Keep us posted.