Does your Chugger nano have enough pressure? I have the CIP sprayball and a March Nano for my 1bbl Chronicals. Haven't fired anything up yet but thought I may have to go with a hardware store sump pump to get enough pressure for the Spray ball. Also how are your seals and hoses holding up to the acids?
I use a $50 1/3HP submersible pump + $40 bucket heater + CIP ball to recirculate hot PBW through my 1BBL Chronical. Lots of pressure, it can fill the fermenter faster than it can drain, so I I need to throttle back the pump periodically to let the bucket refill. This is an open system, so there can be some splashing of the PBW, but I don't think that's a safety issue. It cleans very well except for the yeast scum line and sometimes yeast scum on the coils. Not perfect but still worth it to me. The pump appears to have a thermal switch, because it shuts off if PBW gets much above 150F.
I read concerns about effects of acid on the submersible pump, so for the acid wash I use a Chugger MAX nano pump + CIP ball. Not nearly as much power, but since this is a closed, balanced system, no worries about splashing acid and I can leave it run unattended.