Chlorine levels go down quickly is stabilizer inportant?


LifeTime Supporter
Aug 19, 2014
Pacific NW
add 4lbs of stabilizer to get it around 40 (my pool roughly same size as yours)

The cya will bring down your ph a bit too, so don't bring that down yet.

edit: just noticed your using guess strips (test strips are just not very accurate)

you need a TF100 or Taylor K2006C test kit to get proper test results before you do anything.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
Welcome to TFP!

Yes, stabilizer protects chlorine from the sun. It is also known as cyanuric acid or CYA for short. You want to have 50 ppm of CYA for your sunny location. PH at 7.8 is fine. More here about how to add CYA to your pool, Pool School - Recommended Pool Chemicals

Do some reading here, And here, Pool School - Getting Started

Edit: or 40 for CYA is fine to start with.


TFP Expert
Platinum Supporter
May 23, 2015
Tucson, AZ
Without any stabilizer in the pool water, the half-life of chlorine is about 35mins give or take. So, in a little over four hours of direct noon time sun, you will lose 94% of the chlorine in your pool. SO the answer to your question is - yes, stabilizer is very important.