Chris, let me try and clarify how the Hold-N-Treat along with a PuraSan works. When the initial command is initiated the following happens, the transfer pump turns on, it draws effluent from the holding tank and pushes or delivers it to the 1st stage/ mixer of the PuraSan this is the stage that injects the Oxidizer and breaks down the solids (particulates). At this point the transfer pump is shut down but the 1st mixer runs for a predetermined time. Then everything shuts down for a short period of time. The next phase of the timing repeats the initial phase (transfer pump on, mixer pumps running) as the transfer pump is running it pushes the treated contents of the 1st mixer into the 2nd mixing stage (the 1st mixer is replenished) the transfer pump shuts down and the mixers both run. The final stage is a repeat of the 1st and 2nd stages only this time after the treated contents of mixer 2 are pushed through the thru-hull or overboard discharge. I believe the H-N-T will do 3 cycles before everything shuts down to cool off the pump and mixing motors. Throughout the entire process the transfer pump removes untreated waste from the holding tank and delivers (or as I call it) pushes the fluid through the 2 mixing stages of the PuraSan via the run time of the transfer pump. All pumps and motors are electronically controlled through electronic switches or high current relays. The transfer pump uses an external (auto horn type) relay controlled by the H-N-T module. The PuraSan mixing stages are activated by the control board on the PuraSan. The H-N-T module has circuits that detect the effluent level in the holding tank and will disable the transfer pump if the fluid level is to low for the proper operation and transfer of Effluent between the holding tank and transfer pump.
