To shock or not to shock!?


New member
Jul 1, 2021
Boston, MA, USA
Pool Size
Liquid Chlorine
Hello! My inground pool is in desperate need of shock (pool has been cloudy blue for 2-3 days, pool service confirmed I need to shock)…I got the liquid shock yesterday afternoon after getting water tested, but it rained last night. Pool company suggested I not shock when it rains, so I held off. The weather report says rain for the next few days. Hold off shock until it stops raining completely? Or shock this evening if there is a break in the rain? I am a brand new pool owner (just moved to house with a pool) so trying to learn as much as I can!


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Welcome to the forum!
You need to follow the SLAM Process. To do that, you need a proper test kit. I suggest the TF-100 or Taylor K2006C. A proper test kit is needed to get the accurate water chemistry results needed to follow the TFP protocols.

While you are waiting on your test kit, add 5 ppm FC worth of liquid chlorine / plain bleach to your pool each evening with the pump running. This will replenish the FC lost each day to the sun and also inhibit any algae in the water from growing further.
I suggest you read ABC's of Pool Water Chemistry.
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