All types of chlorine are compatible with PoolRx, but if your’e using Calcium Hypochlorite dilute it in water before pouring it in the pool.
Can I Use Calcium Hypochlorite Cal-Hypo Shock with PoolRx?
You can use Calcium Hypochlorite pool shock with PoolRx, but you should dissolve the Cal-Hypo shock before pouring in the pool.