This is the type of filter which should have a load attached (say audio amplifier experts). The LC network has a resonant frequency. If that frequency comes through a low impedance loop, the LC network boosts its amplitude. If sufficient power is available then the effect runs out of control, and components can be destroyed. In other words, the filter needs to be damped.
I've been entertained by watching this effect in simulations. Theoretically it could be a means to boost sagging mains AC. However it is dangerous if no load is present. So it isn't practical for the consumer market.