Turning on the particles group at once

Hi, Unity community! Here the problem: i have two group of the gameobjects with the children object with the particle system attached. I want to turn them on\off at once due to some game condidtions. My code (c#)

 public void PenetrateEffect(bool White)
         {
             int i;
             if (!White)
             {
                 GameObject[] EffectsB = GameObject.FindGameObjectsWithTag("effect_b");
                 for (i = 0; i < EffectsB.Length; i++)
                 {
                     EffectsB[i].GetComponent<ParticleSystem>().Play();
                 }
             }
             else if (White)
             {
                 GameObject[] EffectsW = GameObject.FindGameObjectsWithTag("effect_w");
                 for (i = 0; i < EffectsW.Length; i++)
                 {
                     EffectsW[i].GetComponent<ParticleSystem>().Play();
                 }
             }
         }

As you see, i used to create the array of the GameObjects based on the tags. And then i simply use the PLay() method for every element of array. It's cause the next: after the event happens only two of eight emitter start to emit particles. I don't understand where i made a mistake.