Should I shock?


Well-known member
I was away for the week and left my wife in charge of adding bleach. She was somewhat lax on the adding bleach schedule. Came back and had a slight algae issue. Along the bottom of one side of the pool where the wall meets the floor for about half the length of the pool there was algae in the crevice and a few other small areas on the walls. The water was clear though. I vacummed, brushed and added chlorine. I did not shock. This was on Wednesday. There has been no sign of anything since. Water is clear and sparkly. Just wondering if there is a hidden enemy waiting. Do you have to shock or is it possible it was caught early enough and I took care of it with my procedure. Overnight FC loss looks pretty normal ~ 0.5 ppm loss.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
If you have ANY visible algae left, you need to shock.

You do not need to shock if....
1. Your pool water is sparkling
2. Your CC's are .5ppm or less
3. You can hold your FC overnight without losing more than 1ppm.

Couldn't tell for sure from your post but it sounds like you no longer need to shock.


LifeTime Supporter
Nov 18, 2009
Sacramento, CA
The rule is to shock if you have algae, or CC ≥ 0.5, or overnight FC loss ≥ 1.0

It sounds like you are OK, but I would have brought it to shock level as soon as I saw the algae. What is your FC, CC, CYA?

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