Sorry I was not clear - RMS is the AC equivalent of DC in terms of work or power. DC Watts is DC Volts * Amps. AC Watts is RMS Volts * Amps.

An RC filter with series R followed by C to gnd, follwed by series R followed by C to gnd is not the same as a single RC with appropriate values. A single RC will have an attenuation slope of 20 dB per decade; 2 stages will have a slope of 40 dB per decade - double the attenuation of unwanted signals.

You can clean up your signal a lot more, although you may not care.