The ones I have had and the ones that others have had that have posted on various forums have found them to not output the GPH
that they say they do (or atleast appear not to) and the ones I have had seem to stop their rotation on the head after a few weeks/months.
The way the system works is there is an impeller inside that spins with the power of the water flowing thru the PH
. This turns a shaft that moves the head left and right. the pressure of doing this also seems to knock down the flow rate of the ph
overall and I have found the side to side motion jams or becomes stationary after a period of time. THen taking the PH
apart and cleaning the mechanism sometimes helps.