I used the geo method before our last trip from va to myrtle beach I installed borax 20 and laundry detergent with about 5 gallons of water! Arrived at beach and checked, sensors reading empty filled up within 2 days and dumped, flushed with clear flush elbow as usual and barely any time until clear!
2011 ram 2500 slt crew cab 6.7 high output cummins
2014 jayco swift 267bhs
"we do it in black pots"