Everything in your inground pool is good with chemicals but the clorine is locked I have added 1eryt5 bags of shock and the clorine still registered 0 please help you They say the clorine is locked?

Test for Cyanuric Acid, this is what causes "Chlorine Lock" however, usually you have the opposite result. High test readings, with no positive effect. The only way to correct this is to physically drain water from the pool and add new. The best way to avoid this problem in the future is to buy higher grade chlorine and shock. tritonunderwater.com