Chlorine upper limit for swimming?

[Elle W]

What are the upper limits for total and free chlorine levels in which it is safe to swim? Mine are both almost 10 right now and I can't find info online as to whether that's safe for kids to swim in. If I added too much CYA, is that the reason for the high levels?

ETA: CYA level 80-100 right now

[Denniswiseman]

You can swim up to your shock level for your CYA
If you are using Trichlor Dichlor then you are adding CYA
Excessive CYA renders your chlorine ineffective and you have to use more to get the same sanitation
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
Chlorine / CYA Chart and
Recommended Pool Levels
To reduce your CYA you have to do a partial drain and refill
Use these common products to balance your pool
Liquid chlorine (sodium hypochlorite or plain bleach)
Muriatic acid (hydrochloric acid) to lower pH and TA
Bicarbonate of soda to raise TA
Aeration will raise pH only
Soda ash will raise pH and TA