Chlorine/cya chart

[Southerncouple88]

Hello, could someone explain how to use this chart? My cya was 70 yesterday have not tested today. I feel like I may need to practice this test a couple of times. Thanks for the help still reading info in poolschool

 

[jblizzle]

Given a CYA of 70ppm, you need to keep the FC above the minimum (5ppm) at all times ... that is the most important thing to realize from the chart.

Note that CYA does not change very quickly unless you are replacing water. May only need to test once every few weeks or a month.

 

[Southerncouple88]

Thanks Jason so keeping fc up is that where I add bleach

 

[jblizzle]

Yup.

Check out these in Pool School:
ABCs of Water Chemistry
Recommended Pool Chemicals
How to Chlorinate Your Pool