Quick question!

Pool has been crystal clear and care has been a breeze for the past couple of weeks. I should be at 30 ppm on CYA, plus whatever ppm 1lb of trichlor would add. I am going on a short vacation next week, 5 days. I am putting a timer on the electrical outlet so the pump will run automatically. I know there will be plenty of bugs & leaves to clean out when we return, but as long as it's not green I can deal with that!

I want to heavily dose the pool with bleach before leaving (next Tuesday evening) to avoid algae yet not so much that it will hurt the liner. Should I just follow the best guess chlorine chart, and dose it to 30ppm where it says Shock+ or would Shock level at 15 be sufficient? I was under impression Shock+ is for dirty water but I am not totally clear on that.

BTW I have the BleachCalc app and thank you whoever came up with it, very handy!