Shuriken Particle System 1 turns on all

I have a Rain system at the mo a ring paticle emits using a sub emitter then a splash particle emitting as a Birth sub emitter but i need each splash to happen where each Ripple happens but not where each rain particle hits.

Rain Ring Splash

So for every rain particle a splash & a ring is emitted but this is way too inifitiant! Idealy I want

Rain Ring Splash

This way I can have 200 Rain partcles & 20 Rings emitting 20 Splash's Rather than 200 Rain particles creating 200 Ring particles. But this doesn't work for me due to not knowing how to turn on the Rain system (with a button click) that then turns on the Ring system without it being a sub emitter

So is there a way to turn on one ParticleSystem which then turns on others without SubEmitting?

Thanks