[CoolROD]

I am not planning on installing a filter. If we start with a new system -or at least a recently cleaned one- the UV clarifier will prevent reproduction on the microorganisms that pass through it.

I want to state that any microorganisms that are clinging to the walls of the system will continue to thrive w/o chemicals. etc.

This is the achilles heel of this setup. But remember the growth rate of these colonies -we are going to neutralize any that pass through the system and should greatly slow their spread!