IMO you are using a domestic water RO that again imo is not suitable for window cleaning day in day out wfp.
I have a 4040, because i need alot of water daily, also i hate waiting for thing and the water you are producing I would have binned it the second day.
upgrade your ro to 300gpd, if money is no problem get a 4040 I am making over 200 litres an hour, to me time is money and time is something i dont seem to have enough of.
i USED THE CUT INTO PIPE TAP MYSELF, I changed it as wqater was not flowing out of it.
easy to change cut pipe three way connector add a pipe use same tap job done.
Ian